diff --git a/src/nodes/QskVertexHelper.h b/src/nodes/QskVertexHelper.h
index 6217f11e..742dcf62 100644
--- a/src/nodes/QskVertexHelper.h
+++ b/src/nodes/QskVertexHelper.h
@@ -10,7 +10,7 @@
 #include "QskGradientDirection.h"
 #include "QskVertex.h"
 
-#include <cmath>
+#include <qmath.h>
 
 namespace QskVertex
 {