diff --git a/include/mysql.h b/include/mysql.h
index 4f6b98c1..8c8e60e9 100644
--- a/include/mysql.h
+++ b/include/mysql.h
@@ -486,8 +486,8 @@ my_bool STDCALL mysql_commit(MYSQL *mysql);
 my_bool STDCALL mysql_rollback(MYSQL *mysql);
 my_ulonglong STDCALL mysql_insert_id(MYSQL *mysql);
 unsigned int STDCALL mysql_errno(MYSQL *mysql);
-char * STDCALL mysql_error(MYSQL *mysql);
-char * STDCALL mysql_info(MYSQL *mysql);
+const char * STDCALL mysql_error(MYSQL *mysql);
+const char * STDCALL mysql_info(MYSQL *mysql);
 unsigned long STDCALL mysql_thread_id(MYSQL *mysql);
 const char * STDCALL mysql_character_set_name(MYSQL *mysql);
 void STDCALL mysql_get_character_set_info(MYSQL *mysql, MY_CHARSET_INFO *cs);
diff --git a/libmariadb/mariadb_lib.c b/libmariadb/mariadb_lib.c
index a856637e..c1b42e05 100644
--- a/libmariadb/mariadb_lib.c
+++ b/libmariadb/mariadb_lib.c
@@ -3291,12 +3291,12 @@ uint STDCALL mysql_errno(MYSQL *mysql)
   return mysql ? mysql->net.last_errno : 0;
 }
 
-char * STDCALL mysql_error(MYSQL *mysql)
+const char * STDCALL mysql_error(MYSQL *mysql)
 {
   return mysql ? (mysql)->net.last_error : (char *)"";
 }
 
-char *STDCALL mysql_info(MYSQL *mysql)
+const char *STDCALL mysql_info(MYSQL *mysql)
 {
   return (mysql)->info;
 }