diff --git a/demos/src/ftgrays.c b/demos/src/ftgrays.c
index 592aae805..899789d3e 100644
--- a/demos/src/ftgrays.c
+++ b/demos/src/ftgrays.c
@@ -56,6 +56,10 @@
 
 #include <ftimage.h>
 
+#if 1
+#include <string.h>
+#endif
+
 #define ErrRaster_Invalid_Outline  -1
 
 #include "ftgrays.h"