diff --git a/libvo/x11_common.c b/libvo/x11_common.c
index d1911401ce..5af4f19ac3 100644
--- a/libvo/x11_common.c
+++ b/libvo/x11_common.c
@@ -733,7 +733,7 @@ void vo_x11_decoration(Display * vo_Display, Window w, int d)
     }
 }
 
-void vo_x11_classhint(Display * display, Window window, char *name)
+void vo_x11_classhint(Display * display, Window window, const char *name)
 {
     XClassHint wmClass;
     pid_t pid = getpid();
diff --git a/libvo/x11_common.h b/libvo/x11_common.h
index c7221d2577..bea422e8b5 100644
--- a/libvo/x11_common.h
+++ b/libvo/x11_common.h
@@ -63,7 +63,7 @@ void vo_uninit( void );
 void vo_hidecursor ( Display* , Window );
 void vo_showcursor( Display *disp, Window win );
 void vo_x11_decoration( Display * vo_Display,Window w,int d );
-void vo_x11_classhint( Display * display,Window window,char *name );
+void vo_x11_classhint( Display * display,Window window,const char *name );
 void vo_x11_nofs_sizepos(int x, int y, int width, int height);
 void vo_x11_sizehint( int x, int y, int width, int height, int max );
 int vo_x11_check_events(Display *mydisplay);