diff --git a/git-rebase.sh b/git-rebase.sh
index 29028dd..5554541 100755
--- a/git-rebase.sh
+++ b/git-rebase.sh
@@ -281,7 +281,7 @@ git-reset --hard "$onto"
 
 # If the $onto is a proper descendant of the tip of the branch, then
 # we just fast forwarded.
-if test "$mb" = "$onto"
+if test "$mb" = "$branch"
 then
 	echo >&2 "Fast-forwarded $branch to $newbase."
 	exit 0