diff --git a/src/win/util.c b/src/win/util.c
index 5d1c812d..49b5bc72 100644
--- a/src/win/util.c
+++ b/src/win/util.c
@@ -37,7 +37,7 @@
 #include <tlhelp32.h>
 #include <windows.h>
 #include <userenv.h>
-
+#include <math.h>
 
 /*
  * Max title length; the only thing MSDN tells us about the maximum length