diff --git a/common/rfb/VNCSConnectionST.cxx b/common/rfb/VNCSConnectionST.cxx
index 5adb766..932abc0 100644
--- a/common/rfb/VNCSConnectionST.cxx
+++ b/common/rfb/VNCSConnectionST.cxx
@@ -1131,7 +1131,7 @@
     accessRights = accessRights | AccessPtrEvents | AccessKeyEvents | AccessView;
     break;
   case 1:
-    accessRights = accessRights & ~(AccessPtrEvents | AccessKeyEvents) | AccessView;
+    accessRights = (accessRights & ~(AccessPtrEvents | AccessKeyEvents)) | AccessView;
     break;
   case 2:
     accessRights = accessRights & ~(AccessPtrEvents | AccessKeyEvents | AccessView);