diff --git a/tests/TestConfig.php b/tests/TestConfig.php
index 3e40764af..87433cc67 100644
--- a/tests/TestConfig.php
+++ b/tests/TestConfig.php
@@ -61,7 +61,8 @@ class TestConfig extends Config
                 </projectFiles>';
     }
 
-    public function getComposerFilePathForClassLike(string $fq_classlike_name): false
+    /** @return false */
+    public function getComposerFilePathForClassLike(string $fq_classlike_name): bool
     {
         return false;
     }