diff --git a/targets/TARGET_STM/TARGET_STM32F4/TARGET_STM32F437xG/TARGET_UBLOX_C030/ONBOARD_UBLOX.cpp b/targets/TARGET_STM/TARGET_STM32F4/TARGET_STM32F437xG/TARGET_UBLOX_C030/ONBOARD_UBLOX.cpp
index 8f00c979ea..2e13396f00 100644
--- a/targets/TARGET_STM/TARGET_STM32F4/TARGET_STM32F437xG/TARGET_UBLOX_C030/ONBOARD_UBLOX.cpp
+++ b/targets/TARGET_STM/TARGET_STM32F4/TARGET_STM32F437xG/TARGET_UBLOX_C030/ONBOARD_UBLOX.cpp
@@ -27,6 +27,7 @@ CellularDevice *CellularDevice::get_target_default_instance()
 {
 #if defined(TARGET_UBLOX_C030_R41XM)
     static UARTSerial serial(MDMTXD, MDMRXD, MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE);
+    serial.set_flow_control(SerialBase::RTSCTS, MDMRTS, MDMCTS);
     static ONBOARD_UBLOX_AT device(&serial);
 #elif defined(TARGET_UBLOX_C030_N211)
     static UARTSerial serial(MDMTXD, MDMRXD, MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE);