diff --git a/targets/TARGET_STM/TARGET_STM32F1/PeripheralPins.h b/targets/TARGET_STM/TARGET_STM32F1/PeripheralPins.h
index 0a523c61ca..93ce0c50b0 100644
--- a/targets/TARGET_STM/TARGET_STM32F1/PeripheralPins.h
+++ b/targets/TARGET_STM/TARGET_STM32F1/PeripheralPins.h
@@ -51,6 +51,8 @@ extern const PinMap PinMap_PWM[];
 
 extern const PinMap PinMap_UART_TX[];
 extern const PinMap PinMap_UART_RX[];
+extern const PinMap PinMap_UART_RTS[];
+extern const PinMap PinMap_UART_CTS[];
 
 //*** SPI ***