diff --git a/mx_mysql.c b/mx_mysql.c
index b18a6e4..ca983b0 100644
--- a/mx_mysql.c
+++ b/mx_mysql.c
@@ -630,7 +630,7 @@ int mx_mysql_option_set_default_file(struct mx_mysql *mysql, char *fname)
     return 0;
 }
 
-int mx_mysql_option_set_default_group(struct mx_mysql *mysql, char *group)
+void mx_mysql_option_set_default_group(struct mx_mysql *mysql, char *group)
 {
     assert(mysql);
 
@@ -638,16 +638,13 @@ int mx_mysql_option_set_default_group(struct mx_mysql *mysql, char *group)
         group = NULL;
 
     mysql->default_group = group;
-
-    return 0;
 }
 
-int mx_mysql_option_set_reconnect(struct mx_mysql *mysql, int reconnect)
+void mx_mysql_option_set_reconnect(struct mx_mysql *mysql, int reconnect)
 {
     assert(mysql);
 
     mysql->reconnect = (bool)!!reconnect;
-    return 0;
 }
 
 static int mx_mysql_real_connect(struct mx_mysql *mysql, const char *host, const char *user, const char *passwd, const char *db, unsigned int port, const char *unix_socket, unsigned long client_flag)
diff --git a/mx_mysql.h b/mx_mysql.h
index 0bf2c81..173e48a 100644
--- a/mx_mysql.h
+++ b/mx_mysql.h
@@ -78,8 +78,8 @@ struct mx_mysql_stmt {
 int mx_mysql_initialize(struct mx_mysql **mysql);
 
 int mx_mysql_option_set_default_file(struct mx_mysql *mysql, char *fname)  __attribute__ ((warn_unused_result));
-int mx_mysql_option_set_default_group(struct mx_mysql *mysql, char *group);
-int mx_mysql_option_set_reconnect(struct mx_mysql *mysql, int reconnect);
+void mx_mysql_option_set_default_group(struct mx_mysql *mysql, char *group);
+void mx_mysql_option_set_reconnect(struct mx_mysql *mysql, int reconnect);
 
 int mx_mysql_connect(struct mx_mysql **mysql);
 int mx_mysql_connect_forever_sec(struct mx_mysql **mysql, unsigned int seconds);