diff --git a/images/nginx-slim/Makefile b/images/nginx-slim/Makefile
index ef00ea06d..c7029a543 100644
--- a/images/nginx-slim/Makefile
+++ b/images/nginx-slim/Makefile
@@ -16,7 +16,7 @@
 TAG ?= 0.28
 REGISTRY ?= quay.io/kubernetes-ingress-controller
 ARCH ?= $(shell go env GOARCH)
-DOCKER ?= gcloud docker -- 
+DOCKER ?= gcloud docker --
 
 ALL_ARCH = amd64 arm arm64 ppc64le
 SED_I?=sed -i