diff --git a/screen-write.c b/screen-write.c
index 952e05e9..677a2b44 100644
--- a/screen-write.c
+++ b/screen-write.c
@@ -2139,8 +2139,8 @@ screen_write_collect_flush_line(struct screen_write_ctx *ctx, u_int y)
 	struct screen_write_citem	*ci, *tmp;
 	struct screen_write_cline	*cl = &s->write_list[y];
 	u_int				 last = UINT_MAX, items = 0, wsx, wsy;
-	u_int				 w_start, w_end, w_length, i;
-	int				 xoff, yoff, written;
+	u_int				 w_length, i;
+	int				 w_start, w_end, xoff, yoff, written;
 	int				 r_start, r_end, c_start, c_end;
 	struct tty_ctx			 ttyctx;
 	struct visible_ranges		*r;
@@ -2179,16 +2179,18 @@ screen_write_collect_flush_line(struct screen_write_ctx *ctx, u_int y)
 			c_start = ci->x;
 			c_end = ci->x + ci->used;
 
-			if (c_start + xoff > r_end || c_end + xoff < r_start)
+			if (c_start + xoff >= r_end || c_end + xoff <= r_start)
 				continue;
 			if (r_start > c_start + xoff)
-				w_start = c_start + (r_start - c_start + xoff);
+				w_start = r_start - xoff;
 			else
 				w_start = c_start;
 			if (c_end + xoff > r_end)
-				w_end = c_end - (c_end + xoff - r_end);
+				w_end = r_end - xoff;
 			else
 				w_end = c_end;
+			if (w_end <= w_start)
+				continue;
 			w_length = w_end - w_start;
 			if (w_length <= 0)
 				continue;