diff --git a/lib/helpers/groups_helper.dart b/lib/helpers/groups_helper.dart
index 849bba3..fa111aa 100644
--- a/lib/helpers/groups_helper.dart
+++ b/lib/helpers/groups_helper.dart
@@ -268,6 +268,15 @@ class GroupsHelper {
             .map((f) => _apiToGroupMembership(f))
             .toList());
 
+  /// Invite a user to join a group
+  ///
+  /// Throws an exception in case of failure
+  static Future<void> sendInvitation(int groupID, int userID) async =>
+      APIRequest.withLogin("groups/invite")
+          .addInt("group_id", groupID)
+          .addInt("userID", userID)
+          .execWithThrow();
+
   /// Cancel a group membership invitation
   ///
   /// Throws an exception in case of failure
diff --git a/lib/ui/screens/group_members_screen.dart b/lib/ui/screens/group_members_screen.dart
index 4cf4b1f..a0da717 100644
--- a/lib/ui/screens/group_members_screen.dart
+++ b/lib/ui/screens/group_members_screen.dart
@@ -96,11 +96,13 @@ class _GroupMembersScreenState extends State<GroupMembersScreen> {
       final userID = await showPickUserDialog(context);
       if (userID == null) return;
 
-      print("Invite user: $userID");
+      await GroupsHelper.sendInvitation(widget.groupID, userID);
     } catch (e, s) {
       print("Could not invite a user! $e\n$s");
       showSimpleSnack(context, tr("Could not invite a user!"));
     }
+
+    _key.currentState.refresh();
   }
 }