diff --git a/tests/PHPStan/Rules/Methods/MissingMethodImplementationRuleTest.php b/tests/PHPStan/Rules/Methods/MissingMethodImplementationRuleTest.php
index 10615f2928..82240f467e 100644
--- a/tests/PHPStan/Rules/Methods/MissingMethodImplementationRuleTest.php
+++ b/tests/PHPStan/Rules/Methods/MissingMethodImplementationRuleTest.php
@@ -59,4 +59,9 @@ public function testEnums(): void
 		]);
 	}
 
+	public function testBug11665(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-11665.php'], []);
+	}
+
 }
diff --git a/tests/PHPStan/Rules/Methods/data/bug-11665.php b/tests/PHPStan/Rules/Methods/data/bug-11665.php
new file mode 100644
index 0000000000..1926a10ac5
--- /dev/null
+++ b/tests/PHPStan/Rules/Methods/data/bug-11665.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace Bug11665;
+
+class Schema extends \SplObjectStorage
+{
+}