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-rw-r--r--src/proto/gui.pro2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/proto/gui.pro b/src/proto/gui.pro
index 136570cb11..fa5ce89441 100644
--- a/src/proto/gui.pro
+++ b/src/proto/gui.pro
@@ -46,7 +46,7 @@ void gui_drag_scrollbar __ARGS((scrollbar_T *sb, long value, int still_dragging)
void gui_may_update_scrollbars __ARGS((void));
void gui_update_scrollbars __ARGS((int force));
int gui_do_scroll __ARGS((void));
-int gui_do_horiz_scroll __ARGS((void));
+int gui_do_horiz_scroll __ARGS((colnr_T leftcol, int compute_longest_lnum));
void gui_check_colors __ARGS((void));
guicolor_T gui_get_color __ARGS((char_u *name));
int gui_get_lightness __ARGS((guicolor_T pixel));