diff --git a/charts/netbox/values.schema.json b/charts/netbox/values.schema.json
index ac3b10a3..9bb498b3 100644
--- a/charts/netbox/values.schema.json
+++ b/charts/netbox/values.schema.json
@@ -1060,7 +1060,7 @@
               "type": "boolean"
             },
             "mirrorGroupsExcept": {
-              "type": "string"
+              "type": "array"
             },
             "cacheTimeout": {
               "type": "integer"
diff --git a/charts/netbox/values.yaml b/charts/netbox/values.yaml
index 9feed32b..e3c3a14d 100644
--- a/charts/netbox/values.yaml
+++ b/charts/netbox/values.yaml
@@ -402,7 +402,7 @@ remoteAuth:
       - CN=Domain Admins,CN=Users,DC=example,dc=com
     findGroupPerms: true
     mirrorGroups: true
-    mirrorGroupsExcept: ""
+    mirrorGroupsExcept: []
     cacheTimeout: 3600
     attrFirstName: givenName
     attrLastName: sn