diff --git a/app/models/auth_source.rb b/app/models/auth_source.rb
index 0b4db9b..d99d33e 100644
--- a/app/models/auth_source.rb
+++ b/app/models/auth_source.rb
@@ -77,7 +77,7 @@ class AuthSource < ActiveRecord::Base
 
   # Try to authenticate a user not yet registered against available sources
   def self.authenticate(login, password)
-    AuthSource.where(:onthefly_register => true).all.each do |source|
+    AuthSource.where(:onthefly_register => true).each do |source|
       begin
         logger.debug "Authenticating '#{login}' against '#{source.name}'" if logger && logger.debug?
         attrs = source.authenticate(login, password)