diff --git a/app/models/queries/filters/shared/user_name_filter.rb b/app/models/queries/filters/shared/user_name_filter.rb
index aa501bdebb50..58956e8ae3df 100644
--- a/app/models/queries/filters/shared/user_name_filter.rb
+++ b/app/models/queries/filters/shared/user_name_filter.rb
@@ -68,7 +68,7 @@ def sql_value
     def sql_concat_name
       case Setting.user_format
       when :firstname_lastname
-        "LOWER(CONCAT(users.firstname, CONCAT(' ', users.lastname)))"
+        "LOWER(CONCAT(users.firstname, ' ', users.lastname))"
       when :firstname
         'LOWER(users.firstname))'
       when :lastname_firstname, :lastname_coma_firstname