diff --git a/src/Matrix4.h b/src/Matrix4.h
index a20c019e9..456677f0f 100644
--- a/src/Matrix4.h
+++ b/src/Matrix4.h
@@ -3,7 +3,7 @@
 
 
 
-
+#define _USE_MATH_DEFINES // Enable non-standard math defines (MSVC)
 #include <math.h>
 
 
diff --git a/src/Vector3.h b/src/Vector3.h
index 80583879a..b7a810fc5 100644
--- a/src/Vector3.h
+++ b/src/Vector3.h
@@ -3,7 +3,7 @@
 
 
 
-
+#define _USE_MATH_DEFINES // Enable non-standard math defines (MSVC)
 #include <math.h>