diff --git a/rules-tests/TypeDeclaration/Rector/StmtsAwareInterface/DeclareStrictTypesRector/Fixture/mix_next_inline_html.php.inc b/rules-tests/TypeDeclaration/Rector/StmtsAwareInterface/DeclareStrictTypesRector/Fixture/mix_next_inline_html.php.inc
new file mode 100644
index 00000000000..2421c95559b
--- /dev/null
+++ b/rules-tests/TypeDeclaration/Rector/StmtsAwareInterface/DeclareStrictTypesRector/Fixture/mix_next_inline_html.php.inc
@@ -0,0 +1,18 @@
+<?php
+
+use rexstan\RexStan;
+
+?>
+<div style="width: 80%; background-color: rgb(32, 43, 53)">
+    Hello
+</div>
+-----
+<?php
+
+declare(strict_types=1);
+
+use rexstan\RexStan;
+?>
+<div style="width: 80%; background-color: rgb(32, 43, 53)">
+    Hello
+</div>
diff --git a/rules-tests/TypeDeclaration/Rector/StmtsAwareInterface/DeclareStrictTypesRector/Fixture/only_inline_html.php.inc b/rules-tests/TypeDeclaration/Rector/StmtsAwareInterface/DeclareStrictTypesRector/Fixture/only_inline_html.php.inc
new file mode 100644
index 00000000000..2addca98e6e
--- /dev/null
+++ b/rules-tests/TypeDeclaration/Rector/StmtsAwareInterface/DeclareStrictTypesRector/Fixture/only_inline_html.php.inc
@@ -0,0 +1,12 @@
+<div style="width: 80%; background-color: rgb(32, 43, 53)">
+    Hello
+</div>
+-----
+<?php
+
+declare(strict_types=1);
+
+?>
+<div style="width: 80%; background-color: rgb(32, 43, 53)">
+    Hello
+</div>
diff --git a/rules/TypeDeclaration/Rector/StmtsAwareInterface/DeclareStrictTypesRector.php b/rules/TypeDeclaration/Rector/StmtsAwareInterface/DeclareStrictTypesRector.php
index 864d87de752..df165047312 100644
--- a/rules/TypeDeclaration/Rector/StmtsAwareInterface/DeclareStrictTypesRector.php
+++ b/rules/TypeDeclaration/Rector/StmtsAwareInterface/DeclareStrictTypesRector.php
@@ -7,11 +7,13 @@
 use PhpParser\Node;
 use PhpParser\Node\Identifier;
 use PhpParser\Node\Scalar\LNumber;
+use PhpParser\Node\Stmt;
 use PhpParser\Node\Stmt\Declare_;
 use PhpParser\Node\Stmt\DeclareDeclare;
 use PhpParser\Node\Stmt\Nop;
 use Rector\ChangesReporting\ValueObject\RectorWithLineChange;
 use Rector\Core\Contract\PhpParser\Node\StmtsAwareInterface;
+use Rector\Core\PhpParser\Node\CustomNode\FileWithoutNamespace;
 use Rector\Core\Rector\AbstractRector;
 use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
 use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
@@ -59,6 +61,14 @@ public function beforeTraverse(array $nodes): ?array
 
         $stmt = current($newStmts);
 
+        if ($stmt instanceof FileWithoutNamespace) {
+            $stmt = current($stmt->stmts);
+
+            if (! $stmt instanceof Stmt) {
+                return null;
+            }
+        }
+
         // when first stmt is Declare_, verify if there is strict_types definition already,
         // as multiple declare is allowed, with declare(strict_types=1) only allowed on very first stmt
         if ($stmt instanceof Declare_) {