diff --git a/sql/sql_union.cc b/sql/sql_union.cc
index 57fc026f4f4..ce79a3c4ad5 100644
--- a/sql/sql_union.cc
+++ b/sql/sql_union.cc
@@ -259,7 +259,7 @@ int st_select_lex_unit::exec()
     }
     for (SELECT_LEX *sl= select_cursor; sl; sl= sl->next_select())
     {
-      ha_rows rows= 0;
+      ha_rows records_at_start= 0;
       thd->lex.current_select= sl;
 
       if (optimized)