diff --git a/src/eval.c b/src/eval.c
index 8f62cb2..f5aa7e9 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -19576,7 +19576,7 @@
 # endif
 	changed_window_setting();
 
-	if (curwin->w_topline == 0)
+	if (curwin->w_topline <= 0)
 	    curwin->w_topline = 1;
 	if (curwin->w_topline > curbuf->b_ml.ml_line_count)
 	    curwin->w_topline = curbuf->b_ml.ml_line_count;
diff --git a/src/version.c b/src/version.c
index 3fc09c8..71258da 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    491,
+/**/
     490,
 /**/
     489,