diff --git a/lib/screens/room/about/permissions.dart b/lib/screens/room/about/permissions.dart
index d3c6878..94558a6 100644
--- a/lib/screens/room/about/permissions.dart
+++ b/lib/screens/room/about/permissions.dart
@@ -31,10 +31,10 @@ class _EditRoomPermissionSetPageState extends State<EditRoomPermissionSetPage> {
     doNetworkRequest(
       sm,
       req: () => postWithCreadentials(
-          path: 'getRoomInfo',
-          credentials: user,
-          target: user.server,
-          body: {'room': widget.tag, 'server': widget.server}),
+        path: 'getRoomInfo',
+        credentials: user,
+        target: user.server,
+        body: {'room': widget.tag, 'server': widget.server}),
       onAnyErr: () {
         // user should not be here
         // close screen
@@ -44,7 +44,7 @@ class _EditRoomPermissionSetPageState extends State<EditRoomPermissionSetPage> {
       onOK: (body) async {
         final info = RoomInfo.fromJSON(body['data']);
         setState(() {
-          permissions = info.permissions;
+            permissions = info.permissions;
         });
         return true;
       },
@@ -69,17 +69,21 @@ class _EditRoomPermissionSetPageState extends State<EditRoomPermissionSetPage> {
         itemBuilder: (context, index) {
           final item = items[index];
 
-          final int col = pow(2, index + 1) as int;
+          final int col = pow(2, index) as int;
 
           return SwitchListTile(
-              title: Text(RoomPermission.name(item, context)),
-              subtitle: Text(RoomPermission.describe(item, context)),
-              onChanged: (state) {
-                setState(() {
-                  permissions += (state ? 1 : -1) * col;
-                });
-              },
-              value: permissions & col != 0);
+            title: Text(RoomPermission.name(item, context)),
+            subtitle: Text(RoomPermission.describe(item, context)),
+            onChanged: (state) {
+              setState(() {
+                  if (state) {
+                    permissions |= col;
+                  } else {
+                    permissions &= ~col;
+                  }
+              });
+            },
+            value: permissions & col != 0);
         },
       ),
       floatingActionButton: FloatingActionButton.extended(
@@ -93,18 +97,18 @@ class _EditRoomPermissionSetPageState extends State<EditRoomPermissionSetPage> {
 
           // update permissions
           doNetworkRequest(sm,
-              req: () => postWithCreadentials(
-                      path: 'setRoomRight',
-                      credentials: user,
-                      target: user.server,
-                      body: {
-                        'room': widget.tag,
-                        'server': widget.server,
-                        'rights': permissions
-                      }),
-              onOK: (_) {
-                router.pop();
-              });
+            req: () => postWithCreadentials(
+              path: 'setRoomRight',
+              credentials: user,
+              target: user.server,
+              body: {
+                'room': widget.tag,
+                'server': widget.server,
+                'rights': permissions
+            }),
+            onOK: (_) {
+              router.pop();
+          });
         },
       ),
     );