diff --git a/win32/lib/wincrt1.c b/win32/lib/wincrt1.c
index 0466da91..77e74b89 100644
--- a/win32/lib/wincrt1.c
+++ b/win32/lib/wincrt1.c
@@ -1,6 +1,7 @@
 //+---------------------------------------------------------------------------
 
 #include <windows.h>
+#include <stdlib.h>
 
 #define __UNKNOWN_APP    0
 #define __CONSOLE_APP    1