diff --git a/tmux.h b/tmux.h
index 5b1f0f33..6839be84 100644
--- a/tmux.h
+++ b/tmux.h
@@ -2073,7 +2073,7 @@ extern const char window_clock_table[14][5][5];
 
 /* window-copy.c */
 extern const struct window_mode window_copy_mode;
-void		 window_copy_init_from_pane(struct window_pane *, u_int);
+void		 window_copy_init_from_pane(struct window_pane *, int);
 void		 window_copy_init_for_output(struct window_pane *);
 void printflike(2, 3) window_copy_add(struct window_pane *, const char *, ...);
 void		 window_copy_vadd(struct window_pane *, const char *, va_list);
diff --git a/window-copy.c b/window-copy.c
index d18c0424..c7d360de 100644
--- a/window-copy.c
+++ b/window-copy.c
@@ -208,7 +208,7 @@ window_copy_init(struct window_pane *wp)
 }
 
 void
-window_copy_init_from_pane(struct window_pane *wp, u_int scroll_exit)
+window_copy_init_from_pane(struct window_pane *wp, int scroll_exit)
 {
 	struct window_copy_mode_data	*data = wp->modedata;
 	struct screen			*s = &data->screen;