diff --git a/elasticsearch/examples/security/Makefile b/elasticsearch/examples/security/Makefile
index 46f0ee783..dcc3ec94d 100644
--- a/elasticsearch/examples/security/Makefile
+++ b/elasticsearch/examples/security/Makefile
@@ -9,7 +9,7 @@ install:
 	helm upgrade --wait --timeout=600 --install --values ./security.yml $(RELEASE) ../../
 
 purge:
-	kubectl delete secrets elastic-credentials elastic-certificates elastic-certificate-pem || true
+	kubectl delete secrets elastic-credentials elastic-certificates elastic-certificate-pem elastic-certificate-crt|| true
 	helm del --purge $(RELEASE)
 
 test: secrets install goss