diff --git a/src/engine/platform/sound/su.cpp b/src/engine/platform/sound/su.cpp
index 08a648f16..69b02a781 100644
--- a/src/engine/platform/sound/su.cpp
+++ b/src/engine/platform/sound/su.cpp
@@ -1,3 +1,4 @@
+#define _USE_MATH_DEFINES
 #include "su.h"
 #include <string.h>