diff --git a/testdata/helm/memcached-operator/Makefile b/testdata/helm/memcached-operator/Makefile
index 2d1eab0d71..6325d97b37 100644
--- a/testdata/helm/memcached-operator/Makefile
+++ b/testdata/helm/memcached-operator/Makefile
@@ -106,13 +106,17 @@ docker-buildx: ## Build and push docker image for the manager for cross-platform
 
 ##@ Deployment
 
+ifndef ignore-not-found
+  ignore-not-found = false
+endif
+
 .PHONY: install
 install: kustomize ## Install CRDs into the K8s cluster specified in ~/.kube/config.
 	$(KUSTOMIZE) build config/crd | kubectl apply -f -
 
 .PHONY: uninstall
 uninstall: kustomize ## Uninstall CRDs from the K8s cluster specified in ~/.kube/config.
-	$(KUSTOMIZE) build config/crd | kubectl delete -f -
+	$(KUSTOMIZE) build config/crd | kubectl delete --ignore-not-found=$(ignore-not-found) -f -
 
 .PHONY: deploy
 deploy: kustomize ## Deploy controller to the K8s cluster specified in ~/.kube/config.
@@ -121,7 +125,7 @@ deploy: kustomize ## Deploy controller to the K8s cluster specified in ~/.kube/c
 
 .PHONY: undeploy
 undeploy: ## Undeploy controller from the K8s cluster specified in ~/.kube/config.
-	$(KUSTOMIZE) build config/default | kubectl delete -f -
+	$(KUSTOMIZE) build config/default | kubectl delete --ignore-not-found=$(ignore-not-found) -f -
 
 OS := $(shell uname -s | tr '[:upper:]' '[:lower:]')
 ARCH := $(shell uname -m | sed 's/x86_64/amd64/' | sed 's/aarch64/arm64/')