diff --git a/src/libraries/turtle/constraints.hpp b/src/libraries/turtle/constraints.hpp
index 79fd9a9..8587fef 100644
--- a/src/libraries/turtle/constraints.hpp
+++ b/src/libraries/turtle/constraints.hpp
@@ -81,6 +81,8 @@ namespace mock
     MOCK_CONSTRAINT( less_equal, actual <= expected_ )
     MOCK_CONSTRAINT( greater_equal, actual >= expected_ )
 
+#undef MOCK_CONSTRAINT
+
 namespace detail
 {
     template< typename Expected >