diff --git a/samples/listctrl/bitmaps/small1.xpm b/samples/listctrl/bitmaps/small1.xpm
index 4dcfd5511f..5e7655ee85 100644
--- a/samples/listctrl/bitmaps/small1.xpm
+++ b/samples/listctrl/bitmaps/small1.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char *small1_xpm[] = {
+static const char *small1_xpm[] = {
 /* columns rows colors chars-per-pixel */
 "16 16 6 1",
 ". c Black",