diff --git a/src/cmd/acme/cols.c b/src/cmd/acme/cols.c
index 30f64c8e..a53280c4 100644
--- a/src/cmd/acme/cols.c
+++ b/src/cmd/acme/cols.c
@@ -417,7 +417,7 @@ colgrow(Column *c, Window *w, int but)
 		if(nl[j])
 			r.max.y += 1 + nl[j]*v->body.fr.font->height;
 		r.min.y = winresize(v, r, c->safe, FALSE);
-		r.max.y += Border;
+		r.max.y = r.min.y + Border;
 		draw(screen, r, display->black, nil, ZP);
 		y1 = r.max.y;
 	}