diff --git a/Makefile b/Makefile
index 02fd53724be7..bc6966de61be 100644
--- a/Makefile
+++ b/Makefile
@@ -107,7 +107,7 @@ clean: ## Remove all generated files
 docker-build: generate fmt vet manifests ## Build the docker image
 	docker build . -t ${IMG}
 	@echo "updating kustomize image patch file for manager resource"
-	sed -i'' -e 's@image: .*@image: '"${IMG}"'@' ./config/default/manager_image_patch.yaml
+	sed -i '' -e 's@image: .*@image: '"${IMG}"'@' ./config/default/manager_image_patch.yaml
 
 .PHONY: docker-push
 docker-push: ## Push the docker image
diff --git a/config/default/manager_image_patch.yaml-e b/config/default/manager_image_patch.yaml-e
deleted file mode 100644
index 3996ddede7a3..000000000000
--- a/config/default/manager_image_patch.yaml-e
+++ /dev/null
@@ -1,11 +0,0 @@
-apiVersion: apps/v1
-kind: StatefulSet
-metadata:
-  name: controller-manager
-  namespace: system
-spec:
-  template:
-    spec:
-      containers:
-      - image: gcr.io/k8s-cluster-api/cluster-api-controller:latest
-        name: manager