diff --git a/gl/grlib.c b/gl/grlib.c
index fd6547a..47ce97e 100644
--- a/gl/grlib.c
+++ b/gl/grlib.c
@@ -8,7 +8,7 @@
 #include "line.h"
 #include "point.h"
 #include "vgagl.h"
-
+#include <string.h>
 /* Global variables */
 
 GraphicsContext currentcontext;