diff --git a/samples/web/refresh.xpm b/samples/web/refresh.xpm
index 9f584e026d..e897f2662a 100644
--- a/samples/web/refresh.xpm
+++ b/samples/web/refresh.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char * refresh_xpm[] = {
+static const char * refresh_xpm[] = {
 "24 24 207 2",
 "  	c None",
 ". 	c #3162A2",
diff --git a/samples/web/stop.xpm b/samples/web/stop.xpm
index 40fb189e04..27adfeda61 100644
--- a/samples/web/stop.xpm
+++ b/samples/web/stop.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char * stop_xpm[] = {
+static const char * stop_xpm[] = {
 "24 24 304 2",
 "  	c None",
 ". 	c #920F0F",
diff --git a/samples/web/wxlogo.xpm b/samples/web/wxlogo.xpm
index 6dba64005f..efaeb5d898 100644
--- a/samples/web/wxlogo.xpm
+++ b/samples/web/wxlogo.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char * wxlogo_xpm[] = {
+static const char * wxlogo_xpm[] = {
 "24 24 57 1",
 " 	c None",
 ".	c #000006",