diff --git a/Engine/source/core/util/tVector.h b/Engine/source/core/util/tVector.h
index 8c54d5d1e..b14388cd9 100644
--- a/Engine/source/core/util/tVector.h
+++ b/Engine/source/core/util/tVector.h
@@ -33,7 +33,9 @@
 #include <algorithm>
 #include "console/engineTypes.h"
 #include "console/engineTypeInfo.h"
-
+#ifndef _MMATHFN_H_
+#include "math/mMathFn.h"
+#endif
 //-----------------------------------------------------------------------------
 // Helper definitions for the vector class.