diff --git a/test/soak/cauldron/cauldron.go b/test/soak/cauldron/cauldron.go
index e2459629b34..867e88c5554 100644
--- a/test/soak/cauldron/cauldron.go
+++ b/test/soak/cauldron/cauldron.go
@@ -103,7 +103,7 @@ func main() {
 	ns := got.Name
 	defer func(ns string) {
 		if err := client.Core().Namespaces().Delete(ns, nil); err != nil {
-			glog.Warningf("Failed to delete namespace ns: %e", ns, err)
+			glog.Warningf("Failed to delete namespace %s: %v", ns, err)
 		} else {
 			// wait until the namespace disappears
 			for i := 0; i < int(namespaceDeleteTimeout/time.Second); i++ {