diff --git a/mosquitto/cert-issuer.yaml b/mosquitto/cert-issuer.yaml
index 8b5e45e..1c6d7d4 100644
--- a/mosquitto/cert-issuer.yaml
+++ b/mosquitto/cert-issuer.yaml
@@ -38,7 +38,6 @@ metadata:
   name: mosquitto-mtls-write-user
   namespace: mosquitto
 spec:
-  isCA: false
   commonName: mosquitto-mtls-write-user
   secretName: mosquitto-mtls-write-user
   privateKey: