diff --git a/src/xterm.c b/src/xterm.c
index 97f39dd3f23..a5e47d2dac8 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -1776,7 +1776,7 @@ static void x_scroll_bar_report_motion ();
 
 static void
 XTmouse_position (f, bar_window, part, x, y, time)
-     FRAME_PTR *f;
+     FRAME_PTR f;
      Lisp_Object *bar_window;
      enum scroll_bar_part *part;
      Lisp_Object *x, *y;