diff --git a/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/closure_instance_of.php.inc b/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/closure_instance_of.php.inc
index 261a9c15..b104bfb0 100644
--- a/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/closure_instance_of.php.inc
+++ b/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/closure_instance_of.php.inc
@@ -34,9 +34,10 @@ final class ClosureInstanceOf extends TestCase
 
         $someMock->expects($this->any())
             ->method('trans')
-            ->with($this->callback(function ($args): void {
+            ->with($this->callback(function ($args): bool {
                 $this->assertCount(5, $args);
                 $this->assertInstanceOf(\stdClass::class, $args[0]);
+                return true;
             }));
     }
 }
diff --git a/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/isset_array_keys.php.inc b/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/isset_array_keys.php.inc
index 268280c4..90d80db3 100644
--- a/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/isset_array_keys.php.inc
+++ b/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/isset_array_keys.php.inc
@@ -34,10 +34,11 @@ final class IssetArrayKeys extends TestCase
 
         $someMock->expects($this->any())
             ->method('trans')
-            ->with($this->callback(function ($args): void {
+            ->with($this->callback(function ($args): bool {
                 $this->assertCount(5, $args);
                 $this->assertArrayHasKey(0, $args);
                 $this->assertSame('some_value', $args[0]);
+                return true;
             }));
     }
 }
diff --git a/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/skip_this.php.inc b/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/skip_this.php.inc
index c895911b..e49c3c3e 100644
--- a/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/skip_this.php.inc
+++ b/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/skip_this.php.inc
@@ -44,6 +44,7 @@ final class SkipThis extends TestCase
                 $this->callback(function ($args): void {
                     $this->assertCount(5, $args);
                     $this->assertSame($this->expectedValue, $args[0]);
+                    return true;
                 })
             );
     }
diff --git a/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/use_variable.php.inc b/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/use_variable.php.inc
index f093fef2..8c605c71 100644
--- a/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/use_variable.php.inc
+++ b/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/use_variable.php.inc
@@ -40,6 +40,7 @@ final class UseVariable extends TestCase
                 $this->callback(function ($args) use ($expectedValue): void {
                     $this->assertCount(5, $args);
                     $this->assertSame($expectedValue, $args[0]);
+                    return true;
                 })
             );
     }
diff --git a/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/use_variable_require_once.php.inc b/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/use_variable_require_once.php.inc
index 50959f19..54f831d5 100644
--- a/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/use_variable_require_once.php.inc
+++ b/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/use_variable_require_once.php.inc
@@ -41,6 +41,7 @@ final class UseVariableRequireOnce extends TestCase
                     $this->assertCount(5, $args);
                     $this->assertSame($expectedValue, $args[0]);
                     $this->assertSame($expectedValue, $args[2]);
+                    return true;
                 })
             );
     }
diff --git a/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/with_arrow_function.php.inc b/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/with_arrow_function.php.inc
index f6262a3e..57a1b32e 100644
--- a/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/with_arrow_function.php.inc
+++ b/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/with_arrow_function.php.inc
@@ -41,6 +41,7 @@ final class WithArrowFunction extends TestCase
                     function ($args): void {
                         $this->assertCount(5, $args);
                         $this->assertInstanceOf(\stdClass::class, $args[0]);
+                        return true;
                     }
                 )
             );
diff --git a/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/with_callback_assert.php.inc b/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/with_callback_assert.php.inc
index f7372c78..ad2b9561 100644
--- a/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/with_callback_assert.php.inc
+++ b/rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/with_callback_assert.php.inc
@@ -34,9 +34,10 @@ final class WithCallbackAssert extends TestCase
 
         $someMock->expects($this->any())
             ->method('trans')
-            ->with($this->callback(function ($args): void {
+            ->with($this->callback(function ($args): bool {
                 $this->assertCount(5, $args);
                 $this->assertSame('some_value', $args[0]);
+                return true;
             }));
     }
 }
diff --git a/rules/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector.php b/rules/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector.php
index 701b7b64..63b9caab 100644
--- a/rules/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector.php
+++ b/rules/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector.php
@@ -51,7 +51,7 @@ public function test()
         $this->createMock('SomeClass')
             ->expects($this->once())
             ->method('someMethod')
-            ->with($this->callback(function ($args): bool {
+            ->with($this->callback(function (array $args): bool {
                 return count($args) === 2 && $args[0] === 'correct'
             }));
     }
@@ -68,9 +68,11 @@ public function test()
         $this->createMock('SomeClass')
             ->expects($this->once())
             ->method('someMethod')
-            ->with($this->callback(function ($args) {
+            ->with($this->callback(function (array $args): bool {
                 $this->assertCount(2, $args);
                 $this->assertSame('correct', $args[0]);
+
+                return true;
             }));
     }
 }
@@ -125,11 +127,13 @@ public function refactor(Node $node): MethodCall|null
             return null;
         }
 
+        // last si return true;
+        $assertExpressions[] = new Return_($this->nodeFactory->createTrue());
+
         $innerFunctionLike = $argAndFunctionLike->getFunctionLike();
 
         if ($innerFunctionLike instanceof Closure) {
             $innerFunctionLike->stmts = $assertExpressions;
-            $innerFunctionLike->returnType = new Identifier('void');
         } else {
             // arrow function -> flip to closure
             $functionLikeInArg = $argAndFunctionLike->getArg();