diff --git a/templates/hooks--update b/templates/hooks--update
index e8c536fb61..a7cf604dd0 100644
--- a/templates/hooks--update
+++ b/templates/hooks--update
@@ -190,7 +190,8 @@ case "$refname_type" in
 			fi
 			echo ""
 			echo $LOGBEGIN
-			git-rev-list --pretty $newrev ^$baserev
+			git-rev-parse --not --all |
+			git-rev-list --stdin --pretty $newrev ^$baserev
 			echo $LOGEND
 			echo ""
 			echo "Diffstat:"