diff --git a/SoObjects/Mailer/SOGoMailFolder.m b/SoObjects/Mailer/SOGoMailFolder.m
index bac7e1cf9..dbc7fc2df 100644
--- a/SoObjects/Mailer/SOGoMailFolder.m
+++ b/SoObjects/Mailer/SOGoMailFolder.m
@@ -364,8 +364,8 @@ static NSString *defaultUserID =  @"anyone";
       for (count = 0; count < max ; count++)
 	{
 	  infos = [allValues objectAtIndex: count];
-	  [prefetchedInfos setObject: infos
-			   forKey: [infos objectForKey: @"uid"]];
+          key = [NSString stringWithFormat: @"%@", [infos objectForKey: @"uid"]];
+	  [prefetchedInfos setObject: infos forKey: key];
 	}
     }
   else