diff --git a/test/soak/serve_hostnames/serve_hostnames.go b/test/soak/serve_hostnames/serve_hostnames.go
index e94f2d88e68..92b48bf5512 100644
--- a/test/soak/serve_hostnames/serve_hostnames.go
+++ b/test/soak/serve_hostnames/serve_hostnames.go
@@ -121,7 +121,7 @@ func main() {
 	ns := got.Name
 	defer func(ns string) {
 		if err := client.CoreV1().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++ {