diff --git a/app/models/user.rb b/app/models/user.rb
index 2bfbbd14e..bb74308ef 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -451,7 +451,7 @@ class User < Principal
 
   # Return true if the user is a member of project
   def member_of?(project)
-    roles_for_project(project).any? {|role| role.member?}
+    projects.to_a.include?(project)
   end
 
   # Returns a hash of user's projects grouped by roles
@@ -692,6 +692,10 @@ class AnonymousUser < User
     UserPreference.new(:user => self)
   end
 
+  def member_of?(project)
+    false
+  end
+
   # Anonymous user can not be destroyed
   def destroy
     false