diff --git a/docs/config.schema.json b/docs/config.schema.json
index da0a58f60..182b7ba26 100644
--- a/docs/config.schema.json
+++ b/docs/config.schema.json
@@ -2559,9 +2559,8 @@
           ]
         },
         "plan_management_iframe_uri": {
-          "description": "Experimental feature to show a plan management tab and iframe",
-          "type": "string",
-          "format": "uri"
+          "description": "Experimental feature to show a plan management tab and iframe. This value is passed through \"as is\" to the client without any validation.",
+          "type": "string"
         }
       }
     },
diff --git a/frontend/schema.graphql b/frontend/schema.graphql
index ded4085a3..0bf788790 100644
--- a/frontend/schema.graphql
+++ b/frontend/schema.graphql
@@ -1757,7 +1757,7 @@ type SiteConfig implements Node {
   Whether users can log in with their email address.
   """
   loginWithEmailAllowed: Boolean!
-  planManagementIframeUri: Url
+  planManagementIframeUri: String
   """
   The ID of the site configuration.
   """
diff --git a/frontend/src/gql/graphql.ts b/frontend/src/gql/graphql.ts
index 7288685c7..1b71b6fb1 100644
--- a/frontend/src/gql/graphql.ts
+++ b/frontend/src/gql/graphql.ts
@@ -1296,7 +1296,7 @@ export type SiteConfig = Node & {
   passwordLoginEnabled: Scalars['Boolean']['output'];
   /** Whether passwords are enabled and users can register using a password. */
   passwordRegistrationEnabled: Scalars['Boolean']['output'];
-  planManagementIframeUri?: Maybe<Scalars['Url']['output']>;
+  planManagementIframeUri?: Maybe<Scalars['String']['output']>;
   /** The URL to the privacy policy. */
   policyUri?: Maybe<Scalars['Url']['output']>;
   /** The server name of the homeserver. */