diff --git a/src/window.c b/src/window.c
index 0a927938..795216d4 100644
--- a/src/window.c
+++ b/src/window.c
@@ -1725,9 +1725,9 @@ void wWindowUnfocus(WWindow *wwin)
 	WMPostNotificationName(WMNChangedFocus, wwin, (void *)False);
 }
 
-void wWindowUpdateName(WWindow *wwin, char *newTitle)
+void wWindowUpdateName(WWindow *wwin, const char *newTitle)
 {
-	char *title;
+	const char *title;
 
 	if (!wwin->frame)
 		return;
diff --git a/src/window.h b/src/window.h
index afd16e70..fddddcbd 100644
--- a/src/window.h
+++ b/src/window.h
@@ -342,7 +342,7 @@ void wUnmanageWindow(WWindow *wwin, Bool restore, Bool destroyed);
 void wWindowFocus(WWindow *wwin, WWindow *owin);
 void wWindowUnfocus(WWindow *wwin);
 
-void wWindowUpdateName(WWindow *wwin, char *newTitle);
+void wWindowUpdateName(WWindow *wwin, const char *newTitle);
 void wWindowConstrainSize(WWindow *wwin, unsigned int *nwidth, unsigned int *nheight);
 void wWindowCropSize(WWindow *wwin, unsigned int maxw, unsigned int maxh,
                      unsigned int *nwidth, unsigned int *nheight);