diff --git a/app/models/user.rb b/app/models/user.rb
index 5d44602be..6d2d48210 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -749,7 +749,7 @@ class User < ActiveRecord::Base
       if val.to_s =~ /t|1|y/
         self.bit_prefs = bit_prefs | bit_flag
       else
-        self.bit_prefs = bit_prefs - bit_flag
+        self.bit_prefs = bit_prefs - (bit_prefs & bit_flag)
       end
     end
   end