diff --git a/grid-view.c b/grid-view.c
index aa83da13..a9144a1f 100644
--- a/grid-view.c
+++ b/grid-view.c
@@ -132,11 +132,9 @@ grid_view_insert_lines(struct grid *gd, u_int py, u_int ny)
 
 /* Insert lines in region. */
 void
-grid_view_insert_lines_region(
-    struct grid *gd, unused u_int rupper, u_int rlower, u_int py, u_int ny)
+grid_view_insert_lines_region(struct grid *gd, u_int rlower, u_int py, u_int ny)
 {
-	GRID_DEBUG(
-	    gd, "rupper=%u, rlower=%u, py=%u, ny=%u", rupper, rlower, py, ny);
+	GRID_DEBUG(gd, "rlower=%u, py=%u, ny=%u", rlower, py, ny);
 
 	rlower = grid_view_y(gd, rlower);
 
@@ -163,11 +161,9 @@ grid_view_delete_lines(struct grid *gd, u_int py, u_int ny)
 
 /* Delete lines inside scroll region. */
 void
-grid_view_delete_lines_region(
-    struct grid *gd, unused u_int rupper, u_int rlower, u_int py, u_int ny)
+grid_view_delete_lines_region(struct grid *gd, u_int rlower, u_int py, u_int ny)
 {
-	GRID_DEBUG(
-	    gd, "rupper=%u, rlower=%u, py=%u, ny=%u", rupper, rlower, py, ny);
+	GRID_DEBUG(gd, "rlower=%u, py=%u, ny=%u", rlower, py, ny);
 
 	rlower = grid_view_y(gd, rlower);
 
diff --git a/screen-write.c b/screen-write.c
index d0049c63..00a56c46 100644
--- a/screen-write.c
+++ b/screen-write.c
@@ -378,10 +378,8 @@ screen_write_insertline(struct screen_write_ctx *ctx, u_int ny)
 
 	if (s->cy < s->rupper || s->cy > s->rlower)
 		grid_view_insert_lines(s->grid, s->cy, ny);
-	else {
-		grid_view_insert_lines_region(
-		    s->grid, s->rupper, s->rlower, s->cy, ny);
-	}
+	else
+		grid_view_insert_lines_region(s->grid, s->rlower, s->cy, ny);
 
 	tty_write_cmd(ctx->wp, TTY_INSERTLINE, ny);
 }
@@ -404,10 +402,8 @@ screen_write_deleteline(struct screen_write_ctx *ctx, u_int ny)
 
 	if (s->cy < s->rupper || s->cy > s->rlower)
 		grid_view_delete_lines(s->grid, s->cy, ny);
-	else {
-		grid_view_delete_lines_region(
-		    s->grid, s->rupper, s->rlower, s->cy, ny);
-	}
+	else
+		grid_view_delete_lines_region(s->grid, s->rlower, s->cy, ny);
 
 	tty_write_cmd(ctx->wp, TTY_DELETELINE, ny);
 }
diff --git a/tmux.h b/tmux.h
index 5f3a3611..bc60cab1 100644
--- a/tmux.h
+++ b/tmux.h
@@ -1337,11 +1337,9 @@ void	 grid_view_clear(struct grid *, u_int, u_int, u_int, u_int);
 void	 grid_view_scroll_region_up(struct grid *, u_int, u_int);
 void	 grid_view_scroll_region_down(struct grid *, u_int, u_int);
 void	 grid_view_insert_lines(struct grid *, u_int, u_int);
-void	 grid_view_insert_lines_region(
-    	     struct grid *, u_int, u_int, u_int, u_int);
+void	 grid_view_insert_lines_region(struct grid *, u_int, u_int, u_int);
 void	 grid_view_delete_lines(struct grid *, u_int, u_int);
-void	 grid_view_delete_lines_region(
-    	     struct grid *, u_int, u_int, u_int, u_int);
+void	 grid_view_delete_lines_region(struct grid *, u_int, u_int, u_int);
 void	 grid_view_insert_cells(struct grid *, u_int, u_int, u_int);
 void	 grid_view_delete_cells(struct grid *, u_int, u_int, u_int);
 char	*grid_view_string_cells(struct grid *, u_int, u_int, u_int);