diff --git a/STM32F1/cores/maple/usb_serial.cpp b/STM32F1/cores/maple/usb_serial.cpp
index 5eaf70e..2f7dadd 100644
--- a/STM32F1/cores/maple/usb_serial.cpp
+++ b/STM32F1/cores/maple/usb_serial.cpp
@@ -178,10 +178,6 @@ uint8 USBSerial::pending(void) {
     return usb_cdcacm_get_pending();
 }
 
-uint8 USBSerial::isConnected(void) {
-    return usb_is_connected(USBLIB) && usb_is_configured(USBLIB) && usb_cdcacm_get_dtr();
-}
-
 uint8 USBSerial::getDTR(void) {
     return usb_cdcacm_get_dtr();
 }
@@ -190,6 +186,10 @@ uint8 USBSerial::getRTS(void) {
     return usb_cdcacm_get_rts();
 }
 
+uint8 USBSerial::operator bool() {
+    return usb_is_connected(USBLIB) && usb_is_configured(USBLIB) && usb_cdcacm_get_dtr();
+}
+
 #if BOARD_HAVE_SERIALUSB
 	#ifdef SERIAL_USB 
 		USBSerial Serial;