diff --git a/src/Mappers/RecursiveTypeMapper.php b/src/Mappers/RecursiveTypeMapper.php
index 3a227a5..b62c3ba 100644
--- a/src/Mappers/RecursiveTypeMapper.php
+++ b/src/Mappers/RecursiveTypeMapper.php
@@ -107,8 +107,12 @@ public function canMapClassToType(string $className): bool
      */
     public function mapClassToType(string $className, ?OutputType $subType): MutableObjectType
     {
-        if (isset($this->classToTypeCache[$className])) {
-            return $this->classToTypeCache[$className];
+        $cacheKey = $className;
+        if ($subType !== null) {
+            $cacheKey .= '__`__'.$subType->name;
+        }
+        if (isset($this->classToTypeCache[$cacheKey])) {
+            return $this->classToTypeCache[$cacheKey];
         }
 
         $closestClassName = $this->findClosestMatchingParent($className);
@@ -129,7 +133,7 @@ public function mapClassToType(string $className, ?OutputType $subType): Mutable
         }
 
         $this->typeRegistry->registerType($type);
-        $this->classToTypeCache[$className] = $type;
+        $this->classToTypeCache[$cacheKey] = $type;
 
         $this->extendType($className, $type);
 
@@ -192,19 +196,23 @@ public function mapClassToInterfaceOrType(string $className, ?OutputType $subTyp
         if ($closestClassName === null) {
             throw CannotMapTypeException::createForType($className);
         }
-        if (!isset($this->interfaces[$closestClassName])) {
+        $cacheKey = $closestClassName;
+        if ($subType !== null) {
+            $cacheKey .= '__`__'.$subType->name;
+        }
+        if (!isset($this->interfaces[$cacheKey])) {
             $objectType = $this->mapClassToType($className, $subType);
 
             $supportedClasses = $this->getClassTree();
             if (isset($supportedClasses[$closestClassName]) && !empty($supportedClasses[$closestClassName]->getChildren())) {
                 // Cast as an interface
-                $this->interfaces[$closestClassName] = new InterfaceFromObjectType($this->namingStrategy->getInterfaceNameFromConcreteName($objectType->name), $objectType, $subType, $this);
-                $this->typeRegistry->registerType($this->interfaces[$closestClassName]);
+                $this->interfaces[$cacheKey] = new InterfaceFromObjectType($this->namingStrategy->getInterfaceNameFromConcreteName($objectType->name), $objectType, $subType, $this);
+                $this->typeRegistry->registerType($this->interfaces[$cacheKey]);
             } else {
-                $this->interfaces[$closestClassName] = $objectType;
+                $this->interfaces[$cacheKey] = $objectType;
             }
         }
-        return $this->interfaces[$closestClassName];
+        return $this->interfaces[$cacheKey];
     }
 
     /**
diff --git a/tests/Fixtures/Integration/Controllers/ProductController.php b/tests/Fixtures/Integration/Controllers/ProductController.php
new file mode 100644
index 0000000..bfae734
--- /dev/null
+++ b/tests/Fixtures/Integration/Controllers/ProductController.php
@@ -0,0 +1,27 @@
+<?php
+
+
+namespace TheCodingMachine\GraphQL\Controllers\Fixtures\Integration\Controllers;
+
+
+use Porpaginas\Arrays\ArrayResult;
+use Psr\Http\Message\UploadedFileInterface;
+use TheCodingMachine\GraphQL\Controllers\Annotations\Mutation;
+use TheCodingMachine\GraphQL\Controllers\Annotations\Query;
+use TheCodingMachine\GraphQL\Controllers\Fixtures\Integration\Models\Contact;
+use TheCodingMachine\GraphQL\Controllers\Fixtures\Integration\Models\Product;
+use TheCodingMachine\GraphQL\Controllers\Fixtures\Integration\Models\User;
+
+class ProductController
+{
+    /**
+     * @Query()
+     * @return Product[]
+     */
+    public function getProducts(): ArrayResult
+    {
+        return new ArrayResult([
+            new Product('Foo', 42.0),
+        ]);
+    }
+}
diff --git a/tests/Fixtures/Integration/Models/Product.php b/tests/Fixtures/Integration/Models/Product.php
new file mode 100644
index 0000000..aebb2c9
--- /dev/null
+++ b/tests/Fixtures/Integration/Models/Product.php
@@ -0,0 +1,54 @@
+<?php
+
+
+namespace TheCodingMachine\GraphQL\Controllers\Fixtures\Integration\Models;
+
+
+use DateTimeInterface;
+use Psr\Http\Message\UploadedFileInterface;
+use TheCodingMachine\GraphQL\Controllers\Annotations\Field;
+use TheCodingMachine\GraphQL\Controllers\Annotations\Type;
+
+/**
+ * @Type()
+ */
+class Product
+{
+    /**
+     * @var string
+     */
+    private $name;
+    /**
+     * @var float
+     */
+    private $price;
+
+    /**
+     * Product constructor.
+     * @param string $name
+     * @param float $price
+     */
+    public function __construct(string $name, float $price)
+    {
+        $this->name = $name;
+        $this->price = $price;
+    }
+
+    /**
+     * @Field(name="name")
+     * @return string
+     */
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    /**
+     * @Field(name="price")
+     * @return float
+     */
+    public function getPrice(): float
+    {
+        return $this->price;
+    }
+}
diff --git a/tests/Integration/EndToEndTest.php b/tests/Integration/EndToEndTest.php
index e14cf81..d7bcf0c 100644
--- a/tests/Integration/EndToEndTest.php
+++ b/tests/Integration/EndToEndTest.php
@@ -44,6 +44,7 @@
 use TheCodingMachine\GraphQL\Controllers\TypeGenerator;
 use TheCodingMachine\GraphQL\Controllers\TypeRegistry;
 use TheCodingMachine\GraphQL\Controllers\Types\TypeResolver;
+use function var_dump;
 use function var_export;
 
 class EndToEndTest extends TestCase
@@ -394,5 +395,68 @@ public function testEndToEndPorpaginas()
                 ],
                 'count' => 2
             ]
-        ], $result->toArray(Debug::RETHROW_INTERNAL_EXCEPTIONS)['data']);    }
+        ], $result->toArray(Debug::RETHROW_INTERNAL_EXCEPTIONS)['data']);
+    }
+
+    /**
+     * This tests is used to be sure that the PorpaginasIterator types are not mixed up when cached (because it has a subtype)
+     */
+    public function testEndToEnd2Iterators()
+    {
+        /**
+         * @var Schema $schema
+         */
+        $schema = $this->mainContainer->get(Schema::class);
+
+        $queryString = '
+        query {
+            getContactsIterator {
+                items(limit: 1, offset: 1) {
+                    name
+                    uppercaseName
+                    ... on User {
+                        email
+                    }
+                }
+                count
+            }
+            
+            getProducts {
+                items {
+                    name
+                    price
+                }
+                count            
+            }
+        }
+        ';
+
+        $result = GraphQL::executeQuery(
+            $schema,
+            $queryString
+        );
+
+        $this->assertSame([
+            'getContactsIterator' => [
+                'items' => [
+                    [
+                        'name' => 'Bill',
+                        'uppercaseName' => 'BILL',
+                        'email' => 'bill@example.com'
+                    ]
+                ],
+                'count' => 2
+            ],
+            'getProducts' => [
+                'items' => [
+                    [
+                        'name' => 'Foo',
+                        'price' => 42.0,
+                    ]
+                ],
+                'count' => 1
+            ]
+        ], $result->toArray(Debug::RETHROW_INTERNAL_EXCEPTIONS)['data']);
+
+    }
 }