diff --git a/libraries/mbed/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/clocking.h b/libraries/mbed/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/clocking.h
index 5693234d81..024d683595 100644
--- a/libraries/mbed/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/clocking.h
+++ b/libraries/mbed/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/clocking.h
@@ -50,9 +50,4 @@
 #define REFERENCE_FREQUENCY 14000000
 #endif
 #endif
-
-#if ( defined(CMU_CTRL_HFLE) && (REFERENCE_FREQUENCY > 24000000) )
-#define LEUART_REF_FREQ (REFERENCE_FREQUENCY / 4)
-#else
-#define LEUART_REF_FREQ (REFERENCE_FREQUENCY / 2)
-#endif
+ 
\ No newline at end of file
diff --git a/libraries/mbed/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/serial_api.c b/libraries/mbed/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/serial_api.c
index 3aa2d7f355..81b68412b7 100644
--- a/libraries/mbed/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/serial_api.c
+++ b/libraries/mbed/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/serial_api.c
@@ -131,7 +131,7 @@ static void uart_init(serial_t *obj)
         init.stopbits = leuartStopbits1;
 
         /* Determine the reference clock, because the correct clock is not set up at init time */
-        init.refFreq = LEUART_REF_FREQ;
+        init.refFreq = 0;
         LEUART_Reset(obj->serial.periph.leuart);
         LEUART_Init(obj->serial.periph.leuart, &init);
     } else {
@@ -488,7 +488,7 @@ void serial_baud(serial_t *obj, int baudrate)
             CMU_ClockEnable(cmuClock_LFB, true);
             CMU_ClockSelectSet(serial_get_clock(obj), cmuSelect_LFXO);
         }
-        LEUART_BaudrateSet(obj->serial.periph.leuart, LEUART_REF_FREQ, (uint32_t)baudrate);
+        LEUART_BaudrateSet(obj->serial.periph.leuart, 0, (uint32_t)baudrate);
     } else {
         USART_BaudrateAsyncSet(obj->serial.periph.uart, REFERENCE_FREQUENCY, (uint32_t)baudrate, usartOVS16);
     }