diff --git a/cluster/gce/upgrade.sh b/cluster/gce/upgrade.sh
index cbca534fae3..3d55f38acf4 100755
--- a/cluster/gce/upgrade.sh
+++ b/cluster/gce/upgrade.sh
@@ -116,6 +116,7 @@ function wait-for-master() {
 function prepare-upgrade() {
   ensure-temp-dir
   detect-project
+  write-cluster-name
   tars_from_version
 }