diff --git a/src/proto/ui.pro b/src/proto/ui.pro
index b022baa..7b65680 100644
--- a/src/proto/ui.pro
+++ b/src/proto/ui.pro
@@ -47,7 +47,7 @@
 int check_row __ARGS((int row));
 void open_app_context __ARGS((void));
 void x11_setup_atoms __ARGS((Display *dpy));
-void x11_setup_selection __ARGS((Widget myShell));
+void x11_setup_selection __ARGS((Widget w));
 void clip_x11_request_selection __ARGS((Widget myShell, Display *dpy, VimClipboard *cbd));
 void clip_x11_lose_selection __ARGS((Widget myShell, VimClipboard *cbd));
 int clip_x11_own_selection __ARGS((Widget myShell, VimClipboard *cbd));