diff --git a/tests/unit/Framework/Constraint/ConstraintTestCase.php b/tests/unit/Framework/Constraint/ConstraintTestCase.php
index 56beb9e300c..811d488ff91 100644
--- a/tests/unit/Framework/Constraint/ConstraintTestCase.php
+++ b/tests/unit/Framework/Constraint/ConstraintTestCase.php
@@ -36,7 +36,7 @@ final public function testIsSelfDescribing(): void
         $this->assertTrue($reflection->implementsInterface(SelfDescribing::class), \sprintf(
             'Failed to assert that "%s" implements "%s".',
             $className,
-            \Countable::class
+            SelfDescribing::class
         ));
     }