diff --git a/src/Standard/Standard_math.hxx b/src/Standard/Standard_math.hxx
index d3a1a83f73..4fa39d0d1a 100644
--- a/src/Standard/Standard_math.hxx
+++ b/src/Standard/Standard_math.hxx
@@ -18,7 +18,10 @@
 
 #ifdef _MSC_VER
 
+#ifndef _USE_MATH_DEFINES
 #define _USE_MATH_DEFINES
+#endif
+
 #include <math.h>
 
 // MSVC versions prior to 12 did not provided acosh, asinh, atanh functions in standard library