diff --git a/include/maxscale/protocol/mysql.h b/include/maxscale/protocol/mysql.h
index daca421df..1f91d4730 100644
--- a/include/maxscale/protocol/mysql.h
+++ b/include/maxscale/protocol/mysql.h
@@ -394,7 +394,7 @@ bool gw_read_backend_handshake(DCB *dcb, GWBUF *buffer);
 mxs_auth_state_t gw_send_backend_auth(DCB *dcb);
 
 /** Write an OK packet to a DCB */
-int mxs_mysql_send_ok(DCB *dcb, int sequence, int affected_rows, const char* message);
+int mxs_mysql_send_ok(DCB *dcb, int sequence, uint8_t affected_rows, const char* message);
 
 /** Check for OK packet */
 bool mxs_mysql_is_ok_packet(GWBUF *buffer);
diff --git a/server/modules/protocol/MySQL/mysql_common.c b/server/modules/protocol/MySQL/mysql_common.c
index 9873b30ae..9dad9552a 100644
--- a/server/modules/protocol/MySQL/mysql_common.c
+++ b/server/modules/protocol/MySQL/mysql_common.c
@@ -1086,11 +1086,11 @@ bool gw_get_shared_session_auth_info(DCB* dcb, MYSQL_session* session)
  * @param dcb DCB where packet is written
  * @param sequence Packet sequence number
  * @param affected_rows Number of affected rows
- *  * @param message SQL message
+ * @param message SQL message
  * @return 1 on success, 0 on error
  *
  */
-int mxs_mysql_send_ok(DCB *dcb, int sequence, int affected_rows, const char* message)
+int mxs_mysql_send_ok(DCB *dcb, int sequence, uint8_t affected_rows, const char* message)
 {
     uint8_t *outbuf = NULL;
     uint32_t mysql_payload_size = 0;