diff --git a/CodeGen/src/OptimizeConstProp.cpp b/CodeGen/src/OptimizeConstProp.cpp
index 6871b8b2..84f8e4e9 100644
--- a/CodeGen/src/OptimizeConstProp.cpp
+++ b/CodeGen/src/OptimizeConstProp.cpp
@@ -9,6 +9,7 @@
 #include "lua.h"
 
 #include <limits.h>
+#include <math.h>
 
 #include <array>
 #include <utility>