diff --git a/sql/sql_lex.cc b/sql/sql_lex.cc
index 5e91f147033..9f69e7dee05 100644
--- a/sql/sql_lex.cc
+++ b/sql/sql_lex.cc
@@ -2326,7 +2326,7 @@ uint8 st_lex::get_effective_with_check(TABLE_LIST *view)
 */
 
 bool
-st_lex::copy_db_to(char **p_db, uint *p_db_length) const
+st_lex::copy_db_to(char **p_db, size_t *p_db_length) const
 {
   if (sphead)
   {
diff --git a/sql/sql_lex.h b/sql/sql_lex.h
index 09ace624559..4ac59fbacde 100644
--- a/sql/sql_lex.h
+++ b/sql/sql_lex.h
@@ -1782,7 +1782,7 @@ typedef struct st_lex : public Query_tables_list
     context_stack.pop();
   }
 
-  bool copy_db_to(char **p_db, uint *p_db_length) const;
+  bool copy_db_to(char **p_db, size_t *p_db_length) const;
 
   Name_resolution_context *current_context()
   {