diff --git a/src/models/actions/update/UpdateUser.ts b/src/models/actions/update/UpdateUser.ts
index 2797b34..c9dedcf 100644
--- a/src/models/actions/update/UpdateUser.ts
+++ b/src/models/actions/update/UpdateUser.ts
@@ -79,11 +79,10 @@ export class UpdateUser {
     enabled: boolean = true;
 
     /**
-     * The updated user's groups.
-     * This just has to contain the group's id - everything else won't be changed.
+     * The updated user's groups' ids.
      */
     @IsOptional()
-    groups?: UserGroup[]
+    groups?: number | number[]
 
     /**
     * The user's profile pic (or rather a url pointing to it).
@@ -124,7 +123,7 @@ export class UpdateUser {
     }
 
     /**
-     * Loads the updated user's groups based on their ids.
+     * Get's all groups for this user by their id's;
      */
     public async getGroups() {
         if (!this.groups) { return null; }
@@ -133,7 +132,7 @@ export class UpdateUser {
             this.groups = [this.groups]
         }
         for (let group of this.groups) {
-            let found = await getConnectionManager().get().getRepository(UserGroup).findOne({ id: group.id });
+            let found = await getConnectionManager().get().getRepository(UserGroup).findOne({ id: group });
             if (!found) { throw new UserGroupNotFoundError(); }
             groups.push(found);
         }