diff --git a/src/Draw.cpp b/src/Draw.cpp
index 44c28157..10eb49bf 100644
--- a/src/Draw.cpp
+++ b/src/Draw.cpp
@@ -1,5 +1,8 @@
 #include <stddef.h>
 #include <stdio.h>
+#ifdef WINDOWS
+#include <stdlib.h>
+#endif
 #include <string.h>
 
 #ifdef WINDOWS