diff --git a/pkg/resources/gce.go b/pkg/resources/gce.go
index 4ebe52ad04..60007ee9d3 100644
--- a/pkg/resources/gce.go
+++ b/pkg/resources/gce.go
@@ -400,7 +400,7 @@ func (d *clusterDiscoveryGCE) listGCEDisks() ([]*ResourceTracker, error) {
 		}
 
 		for _, u := range t.Users {
-			tracker.blocked = append(tracker.blocked, typeInstance+":"+t.Zone+"/"+gce.LastComponent(u))
+			tracker.blocked = append(tracker.blocked, typeInstance+":"+gce.LastComponent(t.Zone)+"/"+gce.LastComponent(u))
 		}
 
 		glog.V(4).Infof("Found resource: %s", t.SelfLink)