diff --git a/ts/components/conversation/ModeratorsAddDialog.tsx b/ts/components/conversation/ModeratorsAddDialog.tsx
index 9a59f9dcb..e201d2cac 100644
--- a/ts/components/conversation/ModeratorsAddDialog.tsx
+++ b/ts/components/conversation/ModeratorsAddDialog.tsx
@@ -7,6 +7,7 @@ import { DefaultTheme } from 'styled-components';
 import { SessionSpinner } from '../session/SessionSpinner';
 import { Flex } from '../basic/Flex';
 import { ConversationModel } from '../../models/conversation';
+import { ApiV2 } from '../../opengroup/opengroupV2';
 interface Props {
   convo: ConversationModel;
   onClose: any;
@@ -63,8 +64,8 @@ export class AddModeratorsDialog extends React.Component<Props, State> {
         isAdded = await this.channelAPI.serverAPI.addModerator([pubkey.key]);
       } else {
         // this is a v2 opengroup
-        // FIXME audric addModerators
-        throw new Error('TODO');
+        const roomInfos = this.props.convo.toOpenGroupV2();
+        isAdded = await ApiV2.addModerator(pubkey, roomInfos);
       }
       if (!isAdded) {
         window.log.warn('failed to add moderators:', isAdded);
diff --git a/ts/opengroup/opengroupV2/OpenGroupAPIV2.ts b/ts/opengroup/opengroupV2/OpenGroupAPIV2.ts
index cd61f3d9a..03ea7013b 100644
--- a/ts/opengroup/opengroupV2/OpenGroupAPIV2.ts
+++ b/ts/opengroup/opengroupV2/OpenGroupAPIV2.ts
@@ -631,7 +631,7 @@ export const addModerator = async (
     room: roomInfos.roomId,
     server: roomInfos.serverUrl,
     isAuthRequired: true,
-    queryParams: { public_key: userToAddAsMods.key },
+    queryParams: { public_key: userToAddAsMods.key, room_id: roomInfos.roomId },
     endpoint: 'moderators',
   };
   const addModResult = await sendOpenGroupV2Request(request);