diff --git a/argocd/apps/mattermost/mattermnost.yaml b/argocd/apps/mattermost/mattermnost.yaml
index 69d3f5c..e26eb3e 100644
--- a/argocd/apps/mattermost/mattermnost.yaml
+++ b/argocd/apps/mattermost/mattermnost.yaml
@@ -33,7 +33,11 @@ spec:
           mysqlUser: "mmdbuser"
           mysqlPassword: "mmdbpwd"
           mysqlDatabase: mattermost
-          
+
+        externalDB:
+          enabled: true
+          externalConnectionString: "mmdbuser:mmdbpwd@tcp(mattermost-mysql:3306)/mattermost?charset=utf8mb4,utf8&readTimeout=30s&writeTimeout=30s"
+
   destination:
     server: 'https://kubernetes.default.svc'
     namespace: mattermost