diff --git a/bochs/gui/bitmaps/usbdbg_trigger.xpm b/bochs/gui/bitmaps/usbdbg_trigger.xpm
index 9a2ed0d25..17c6b769d 100644
--- a/bochs/gui/bitmaps/usbdbg_trigger.xpm
+++ b/bochs/gui/bitmaps/usbdbg_trigger.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char *usbdbg_trigger_xpm[] = {
+static const char *usbdbg_trigger_xpm[] = {
 /* columns rows colors chars-per-pixel */
 "32 32 2 1 ",
 ". c None",