diff --git a/soh/soh/Enhancements/randomizer/draw.cpp b/soh/soh/Enhancements/randomizer/draw.cpp
index bd7f92a84c..d1e9db40ee 100644
--- a/soh/soh/Enhancements/randomizer/draw.cpp
+++ b/soh/soh/Enhancements/randomizer/draw.cpp
@@ -20,6 +20,11 @@
 #include "soh_assets.h"
 #include "soh/Enhancements/cosmetics/cosmeticsTypes.h"
 
+// no idea why this suddently decided it didn't exist on windows
+#ifndef M_PI_2
+#define M_PI_2 1.57079632679489661923
+#endif
+
 extern "C" {
 extern SaveContext gSaveContext;
 }