diff --git a/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC11XX/serial_api.c b/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC11XX/serial_api.c
index df8b15338c..6b12c50345 100644
--- a/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC11XX/serial_api.c
+++ b/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC11XX/serial_api.c
@@ -274,3 +274,11 @@ void serial_clear(serial_t *obj) {
 void serial_pinout_tx(PinName tx) {
     pinmap_pinout(tx, PinMap_UART_TX);
 }
+
+void serial_break_clear(serial_t *obj) {
+    obj->uart->LCR &= ~(1 << 6);
+}
+
+void serial_break_set(serial_t *obj) {
+    obj->uart->LCR |= 1 << 6;
+}