diff --git a/ApplicationCode/ProjectDataModel/Surfaces/RimSurface.cpp b/ApplicationCode/ProjectDataModel/Surfaces/RimSurface.cpp
index d20e9ec7b9..6b9d2e684a 100644
--- a/ApplicationCode/ProjectDataModel/Surfaces/RimSurface.cpp
+++ b/ApplicationCode/ProjectDataModel/Surfaces/RimSurface.cpp
@@ -26,6 +26,8 @@
 
 #include "cafPdmUiDoubleSliderEditor.h"
 
+#include <cmath>
+
 CAF_PDM_ABSTRACT_SOURCE_INIT( RimSurface, "SurfaceInterface" );
 
 //--------------------------------------------------------------------------------------------------