diff --git a/src/lfunc.c b/src/lfunc.c
index be1e388..0076910 100644
--- a/src/lfunc.c
+++ b/src/lfunc.c
@@ -11,6 +11,9 @@
 
 
 #include <stddef.h>
+#ifdef USE_YK
+#include <stdlib.h>
+#endif
 
 #include "lua.h"