diff --git a/lib/Finder/ComposerFinder.php b/lib/Finder/ComposerFinder.php
index cd69089..b8ad03d 100644
--- a/lib/Finder/ComposerFinder.php
+++ b/lib/Finder/ComposerFinder.php
@@ -8,6 +8,7 @@
 use Iterator;
 use Kcs\ClassFinder\Iterator\ComposerIterator;
 use Kcs\ClassFinder\Iterator\FilteredComposerIterator;
+use Kcs\ClassFinder\Reflection\ReflectorFactoryInterface;
 use Reflector;
 use RuntimeException;
 use Symfony\Component\Debug\DebugClassLoader;
@@ -25,21 +26,29 @@ final class ComposerFinder implements FinderInterface
     use ReflectionFilterTrait;
 
     private ClassLoader $loader;
+    private ?ReflectorFactoryInterface $reflectorFactory = null;
 
     public function __construct(?ClassLoader $loader = null)
     {
         $this->loader = $loader ?? self::getValidLoader();
     }
 
+    public function setReflectorFactory(?ReflectorFactoryInterface $reflectorFactory): self
+    {
+        $this->reflectorFactory = $reflectorFactory;
+
+        return $this;
+    }
+
     /**
      * @return Iterator<Reflector>
      */
     public function getIterator(): Iterator
     {
         if ($this->namespaces || $this->dirs || $this->notNamespaces) {
-            $iterator = new FilteredComposerIterator($this->loader, $this->namespaces, $this->notNamespaces, $this->dirs);
+            $iterator = new FilteredComposerIterator($this->loader, $this->reflectorFactory, $this->namespaces, $this->notNamespaces, $this->dirs);
         } else {
-            $iterator = new ComposerIterator($this->loader);
+            $iterator = new ComposerIterator($this->loader, $this->reflectorFactory);
         }
 
         return $this->applyFilters($iterator);
diff --git a/lib/Finder/Psr0Finder.php b/lib/Finder/Psr0Finder.php
index 0890d94..8e2a063 100644
--- a/lib/Finder/Psr0Finder.php
+++ b/lib/Finder/Psr0Finder.php
@@ -7,6 +7,7 @@
 use Iterator;
 use Kcs\ClassFinder\Iterator\Psr0Iterator;
 use Kcs\ClassFinder\PathNormalizer;
+use Kcs\ClassFinder\Reflection\ReflectorFactoryInterface;
 use Reflector;
 
 use function Safe\substr;
@@ -22,6 +23,7 @@ final class Psr0Finder implements FinderInterface
 
     private string $namespace;
     private string $path;
+    private ?ReflectorFactoryInterface $reflectorFactory = null;
 
     public function __construct(string $namespace, string $path)
     {
@@ -38,11 +40,18 @@ public function __construct(string $namespace, string $path)
         $this->path = PathNormalizer::resolvePath($path);
     }
 
+    public function setReflectorFactory(?ReflectorFactoryInterface $reflectorFactory): self
+    {
+        $this->reflectorFactory = $reflectorFactory;
+
+        return $this;
+    }
+
     /**
      * @return Iterator<Reflector>
      */
     public function getIterator(): Iterator
     {
-        return $this->applyFilters(new Psr0Iterator($this->namespace, $this->path));
+        return $this->applyFilters(new Psr0Iterator($this->namespace, $this->path, $this->reflectorFactory));
     }
 }
diff --git a/lib/Finder/Psr4Finder.php b/lib/Finder/Psr4Finder.php
index 1f3be20..40206e8 100644
--- a/lib/Finder/Psr4Finder.php
+++ b/lib/Finder/Psr4Finder.php
@@ -7,6 +7,7 @@
 use Iterator;
 use Kcs\ClassFinder\Iterator\Psr4Iterator;
 use Kcs\ClassFinder\PathNormalizer;
+use Kcs\ClassFinder\Reflection\ReflectorFactoryInterface;
 use Reflector;
 
 use function Safe\substr;
@@ -22,6 +23,7 @@ final class Psr4Finder implements FinderInterface
 
     private string $namespace;
     private string $path;
+    private ?ReflectorFactoryInterface $reflectorFactory = null;
 
     public function __construct(string $namespace, string $path)
     {
@@ -38,11 +40,18 @@ public function __construct(string $namespace, string $path)
         $this->path = $path;
     }
 
+    public function setReflectorFactory(?ReflectorFactoryInterface $reflectorFactory): self
+    {
+        $this->reflectorFactory = $reflectorFactory;
+
+        return $this;
+    }
+
     /**
      * @return Iterator<Reflector>
      */
     public function getIterator(): Iterator
     {
-        return $this->applyFilters(new Psr4Iterator($this->namespace, $this->path));
+        return $this->applyFilters(new Psr4Iterator($this->namespace, $this->path, $this->reflectorFactory));
     }
 }
diff --git a/lib/Iterator/ComposerIterator.php b/lib/Iterator/ComposerIterator.php
index 7953546..de16831 100644
--- a/lib/Iterator/ComposerIterator.php
+++ b/lib/Iterator/ComposerIterator.php
@@ -6,8 +6,9 @@
 
 use Composer\Autoload\ClassLoader;
 use Generator;
+use Kcs\ClassFinder\Reflection\NativeReflectorFactory;
+use Kcs\ClassFinder\Reflection\ReflectorFactoryInterface;
 use Kcs\ClassFinder\Util\ErrorHandler;
-use ReflectionClass;
 use Throwable;
 
 /**
@@ -16,10 +17,12 @@
 final class ComposerIterator extends ClassIterator
 {
     private ClassLoader $classLoader;
+    private ReflectorFactoryInterface $reflectorFactory;
 
-    public function __construct(ClassLoader $classLoader, int $flags = 0)
+    public function __construct(ClassLoader $classLoader, ?ReflectorFactoryInterface $reflectorFactory = null, int $flags = 0)
     {
         $this->classLoader = $classLoader;
+        $this->reflectorFactory = $reflectorFactory ?? new NativeReflectorFactory();
 
         parent::__construct($flags);
     }
@@ -38,7 +41,7 @@ private function searchInClassMap(): Generator
         foreach ($this->classLoader->getClassMap() as $class => $file) {
             ErrorHandler::register();
             try {
-                $reflectionClass = new ReflectionClass($class);
+                $reflectionClass = $this->reflectorFactory->reflect($class);
             } catch (Throwable $e) { /** @phpstan-ignore-line */
                 continue;
             } finally {
@@ -64,13 +67,13 @@ private function searchInPsrMap(): Generator
 
         foreach ($this->classLoader->getPrefixesPsr4() as $ns => $dirs) {
             foreach ($dirs as $dir) {
-                yield from new Psr4Iterator($ns, $dir, 0, $this->classLoader->getClassMap());
+                yield from new Psr4Iterator($ns, $dir, $this->reflectorFactory, 0, $this->classLoader->getClassMap());
             }
         }
 
         foreach ($this->classLoader->getPrefixes() as $ns => $dirs) {
             foreach ($dirs as $dir) {
-                yield from new Psr0Iterator($ns, $dir, 0, $this->classLoader->getClassMap());
+                yield from new Psr0Iterator($ns, $dir, $this->reflectorFactory, 0, $this->classLoader->getClassMap());
             }
         }
     }
diff --git a/lib/Iterator/FilteredComposerIterator.php b/lib/Iterator/FilteredComposerIterator.php
index 1837dab..2a8324f 100644
--- a/lib/Iterator/FilteredComposerIterator.php
+++ b/lib/Iterator/FilteredComposerIterator.php
@@ -7,8 +7,9 @@
 use Composer\Autoload\ClassLoader;
 use Generator;
 use Kcs\ClassFinder\PathNormalizer;
+use Kcs\ClassFinder\Reflection\NativeReflectorFactory;
+use Kcs\ClassFinder\Reflection\ReflectorFactoryInterface;
 use Kcs\ClassFinder\Util\ErrorHandler;
-use ReflectionClass;
 use Throwable;
 
 use function array_map;
@@ -29,6 +30,7 @@
 final class FilteredComposerIterator extends ClassIterator
 {
     private ClassLoader $classLoader;
+    private ReflectorFactoryInterface $reflectorFactory;
 
     /** @var string[]|null */
     private ?array $namespaces = null;
@@ -37,16 +39,17 @@ final class FilteredComposerIterator extends ClassIterator
     private ?array $notNamespaces = null;
 
     /** @var string[]|null */
-    private ?array $dirs = null;
+    private ?array $dirs;
 
     /**
      * @param string[]|null $namespaces
      * @param string[]|null $notNamespaces
      * @param string[]|null $dirs
      */
-    public function __construct(ClassLoader $classLoader, ?array $namespaces, ?array $notNamespaces, ?array $dirs, int $flags = 0)
+    public function __construct(ClassLoader $classLoader, ?ReflectorFactoryInterface $reflectorFactory = null, ?array $namespaces, ?array $notNamespaces, ?array $dirs, int $flags = 0)
     {
         $this->classLoader = $classLoader;
+        $this->reflectorFactory = $reflectorFactory ?? new NativeReflectorFactory();
         $this->dirs = $dirs !== null ? array_map(PathNormalizer::class . '::resolvePath', $dirs) : $dirs;
 
         if ($namespaces !== null) {
@@ -86,7 +89,7 @@ private function searchInClassMap(): Generator
 
             ErrorHandler::register();
             try {
-                $reflectionClass = new ReflectionClass($class);
+                $reflectionClass = $this->reflectorFactory->reflect($class);
             } catch (Throwable $e) { /** @phpstan-ignore-line */
                 continue;
             } finally {
@@ -111,11 +114,11 @@ private function searchInPsrMap(): Generator
         }
 
         foreach ($this->traversePrefixes($this->classLoader->getPrefixesPsr4()) as $ns => $dir) {
-            yield from new Psr4Iterator($ns, $dir, 0, $this->classLoader->getClassMap(), $this->notNamespaces);
+            yield from new Psr4Iterator($ns, $dir, $this->reflectorFactory, 0, $this->classLoader->getClassMap(), $this->notNamespaces);
         }
 
         foreach ($this->traversePrefixes($this->classLoader->getPrefixes()) as $ns => $dir) {
-            yield from new Psr0Iterator($ns, $dir, 0, $this->classLoader->getClassMap(), $this->notNamespaces);
+            yield from new Psr0Iterator($ns, $dir, $this->reflectorFactory, 0, $this->classLoader->getClassMap(), $this->notNamespaces);
         }
     }
 
diff --git a/lib/Iterator/Psr0Iterator.php b/lib/Iterator/Psr0Iterator.php
index 53569a4..e0ccbe9 100644
--- a/lib/Iterator/Psr0Iterator.php
+++ b/lib/Iterator/Psr0Iterator.php
@@ -7,8 +7,9 @@
 use Closure;
 use Generator;
 use Kcs\ClassFinder\PathNormalizer;
+use Kcs\ClassFinder\Reflection\NativeReflectorFactory;
+use Kcs\ClassFinder\Reflection\ReflectorFactoryInterface;
 use Kcs\ClassFinder\Util\ErrorHandler;
-use ReflectionClass;
 use Throwable;
 
 use function array_map;
@@ -27,6 +28,7 @@ final class Psr0Iterator extends ClassIterator
 
     private string $namespace;
     private int $pathLen;
+    private ReflectorFactoryInterface $reflectorFactory;
 
     /** @var string[] */
     private array $classMap;
@@ -38,10 +40,17 @@ final class Psr0Iterator extends ClassIterator
      * @param array<string, mixed> $classMap
      * @param string[] $excludeNamespaces
      */
-    public function __construct(string $namespace, string $path, int $flags = 0, array $classMap = [], ?array $excludeNamespaces = null)
-    {
+    public function __construct(
+        string $namespace,
+        string $path,
+        ?ReflectorFactoryInterface $reflectorFactory = null,
+        int $flags = 0,
+        array $classMap = [],
+        ?array $excludeNamespaces = null
+    ) {
         $this->namespace = $namespace;
         $this->path = PathNormalizer::resolvePath($path);
+        $this->reflectorFactory = $reflectorFactory ?? new NativeReflectorFactory();
         $this->pathLen = strlen($this->path);
         $this->classMap = array_map(PathNormalizer::class . '::resolvePath', $classMap);
         $this->excludeNamespaces = $excludeNamespaces;
@@ -100,7 +109,7 @@ protected function getGenerator(): Generator
                 continue;
             }
 
-            yield $class => new ReflectionClass($class);
+            yield $class => $this->reflectorFactory->reflect($class);
         }
     }
 }
diff --git a/lib/Iterator/Psr4Iterator.php b/lib/Iterator/Psr4Iterator.php
index f76c818..c3bc468 100644
--- a/lib/Iterator/Psr4Iterator.php
+++ b/lib/Iterator/Psr4Iterator.php
@@ -7,8 +7,9 @@
 use Closure;
 use Generator;
 use Kcs\ClassFinder\PathNormalizer;
+use Kcs\ClassFinder\Reflection\NativeReflectorFactory;
+use Kcs\ClassFinder\Reflection\ReflectorFactoryInterface;
 use Kcs\ClassFinder\Util\ErrorHandler;
-use ReflectionClass;
 use Throwable;
 
 use function array_map;
@@ -27,6 +28,7 @@ final class Psr4Iterator extends ClassIterator
 
     private string $namespace;
     private int $prefixLen;
+    private ReflectorFactoryInterface $reflectorFactory;
 
     /** @var array<string, mixed> */
     private array $classMap;
@@ -38,10 +40,17 @@ final class Psr4Iterator extends ClassIterator
      * @param array<string, mixed> $classMap
      * @param string[] $excludeNamespaces
      */
-    public function __construct(string $namespace, string $path, int $flags = 0, array $classMap = [], ?array $excludeNamespaces = null)
-    {
+    public function __construct(
+        string $namespace,
+        string $path,
+        ?ReflectorFactoryInterface $reflectorFactory = null,
+        int $flags = 0,
+        array $classMap = [],
+        ?array $excludeNamespaces = null
+    ) {
         $this->namespace = $namespace;
         $this->path = PathNormalizer::resolvePath($path);
+        $this->reflectorFactory = $reflectorFactory ?? new NativeReflectorFactory();
         $this->prefixLen = strlen($this->path);
         $this->classMap = array_map(PathNormalizer::class . '::resolvePath', $classMap);
         $this->excludeNamespaces = $excludeNamespaces;
@@ -96,7 +105,7 @@ protected function getGenerator(): Generator
                 continue;
             }
 
-            yield $class => new ReflectionClass($class);
+            yield $class => $this->reflectorFactory->reflect($class);
         }
     }
 }
diff --git a/lib/Reflection/NativeReflectorFactory.php b/lib/Reflection/NativeReflectorFactory.php
new file mode 100644
index 0000000..e09734c
--- /dev/null
+++ b/lib/Reflection/NativeReflectorFactory.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kcs\ClassFinder\Reflection;
+
+use ReflectionClass;
+
+class NativeReflectorFactory implements ReflectorFactoryInterface
+{
+    public function reflect(string $className): object
+    {
+        return new ReflectionClass($className);
+    }
+}
diff --git a/lib/Reflection/ReflectorFactoryInterface.php b/lib/Reflection/ReflectorFactoryInterface.php
new file mode 100644
index 0000000..67c00ea
--- /dev/null
+++ b/lib/Reflection/ReflectorFactoryInterface.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kcs\ClassFinder\Reflection;
+
+interface ReflectorFactoryInterface
+{
+    /**
+     * Builds a reflector object.
+     *
+     * Default implementation (NativeReflectorFactory) will always return an instance
+     * of ReflectionClass, but this is not guaranteed for other factories.
+     *
+     * @phpstan-param class-string $className
+     */
+    public function reflect(string $className): object;
+}
diff --git a/tests/Iterator/ComposerIteratorTest.php b/tests/Iterator/ComposerIteratorTest.php
index d9bcac8..dc27203 100644
--- a/tests/Iterator/ComposerIteratorTest.php
+++ b/tests/Iterator/ComposerIteratorTest.php
@@ -126,7 +126,7 @@ public function testComposerIteratorShouldSkipNonInstantiableClass(): void
             ];
         }, null, ClassLoader::class))();
 
-        $iterator = new ComposerIterator($loader, ClassIterator::SKIP_NON_INSTANTIABLE);
+        $iterator = new ComposerIterator($loader, null, ClassIterator::SKIP_NON_INSTANTIABLE);
 
         self::assertEquals([
             Psr4\BarBar::class => new ReflectionClass(Psr4\BarBar::class),
diff --git a/tests/Iterator/FilteredComposerIteratorTest.php b/tests/Iterator/FilteredComposerIteratorTest.php
index be4e4ed..6281265 100644
--- a/tests/Iterator/FilteredComposerIteratorTest.php
+++ b/tests/Iterator/FilteredComposerIteratorTest.php
@@ -44,7 +44,7 @@ protected function setUp(): void
 
     public function testComposerIteratorShouldWork(): void
     {
-        $iterator = new FilteredComposerIterator($this->loader, null, null, null);
+        $iterator = new FilteredComposerIterator($this->loader, null, null, null, null);
 
         self::assertEquals([
             self::class => new ReflectionClass(self::class),
@@ -68,7 +68,7 @@ public function testComposerIteratorShouldFilterNotIntersectingPath(): void
         // intersects perfectly with the requested dirs. The upper finder should filter out the
         // non-matching results.
 
-        $iterator = new FilteredComposerIterator($this->loader, null, null, [__DIR__ . '/../..' . '/data/Composer/Psr4/SubNs']);
+        $iterator = new FilteredComposerIterator($this->loader, null, null, null, [__DIR__ . '/../..' . '/data/Composer/Psr4/SubNs']);
 
         self::assertEquals([
             Psr4\BarBar::class => new ReflectionClass(Psr4\BarBar::class),
diff --git a/tests/Iterator/Psr0IteratorTest.php b/tests/Iterator/Psr0IteratorTest.php
index 799deb3..03ec481 100644
--- a/tests/Iterator/Psr0IteratorTest.php
+++ b/tests/Iterator/Psr0IteratorTest.php
@@ -6,6 +6,7 @@
 
 use Kcs\ClassFinder\Fixtures\Psr0;
 use Kcs\ClassFinder\Iterator\Psr0Iterator;
+use Kcs\ClassFinder\Reflection\NativeReflectorFactory;
 use PHPUnit\Framework\TestCase;
 use ReflectionClass;
 
@@ -14,11 +15,12 @@
 
 class Psr0IteratorTest extends TestCase
 {
-    public function testIteratorShouldWork()
+    public function testIteratorShouldWork(): void
     {
         $iterator = new Psr0Iterator(
             'Kcs\\ClassFinder\\Fixtures\\Psr0\\',
-            realpath(__DIR__ . '/../../data/Composer/Psr0')
+            realpath(__DIR__ . '/../../data/Composer/Psr0'),
+            new NativeReflectorFactory()
         );
 
         self::assertEquals([
diff --git a/tests/Iterator/Psr4IteratorTest.php b/tests/Iterator/Psr4IteratorTest.php
index 5fcabe5..314bebd 100644
--- a/tests/Iterator/Psr4IteratorTest.php
+++ b/tests/Iterator/Psr4IteratorTest.php
@@ -6,6 +6,7 @@
 
 use Kcs\ClassFinder\Fixtures\Psr4;
 use Kcs\ClassFinder\Iterator\Psr4Iterator;
+use Kcs\ClassFinder\Reflection\NativeReflectorFactory;
 use PHPUnit\Framework\TestCase;
 use ReflectionClass;
 
@@ -14,11 +15,12 @@
 
 class Psr4IteratorTest extends TestCase
 {
-    public function testIteratorShouldWork()
+    public function testIteratorShouldWork(): void
     {
         $iterator = new Psr4Iterator(
             'Kcs\\ClassFinder\\Fixtures\\Psr4\\',
-            realpath(__DIR__ . '/../../data/Composer/Psr4')
+            realpath(__DIR__ . '/../../data/Composer/Psr4'),
+            new NativeReflectorFactory()
         );
 
         self::assertEquals([