diff --git a/reference/constraints/IsFalse.rst b/reference/constraints/IsFalse.rst
index 861072a1250..e476fb25387 100644
--- a/reference/constraints/IsFalse.rst
+++ b/reference/constraints/IsFalse.rst
@@ -97,7 +97,7 @@ method returns **false**:
             public static function loadValidatorMetadata(ClassMetadata $metadata)
             {
                 $metadata->addGetterConstraint('stateInvalid', new Assert\IsFalse([
-                    'message' => 'You've entered an invalid state.',
+                    'message' => "You've entered an invalid state.",
                 ]));
             }
         }