diff --git a/rpitx.py b/rpitx.py
index e8fcf468..b20daee6 100644
--- a/rpitx.py
+++ b/rpitx.py
@@ -782,6 +782,10 @@ if __name__ == "__main__":
 			print("turn on FM rx")
 			output(pd, 1)
 			output(ptt, 1)
+
+			GPIO.setmode(GPIO.BCM)  # added to make Tx LED work on Pi 4
+			GPIO.setup(txLed, GPIO.OUT)
+			
 			if (command_tx == True):
 #				system("sudo nc -l 8080 | csdr convert_i16_f | csdr fir_interpolate_cc 2 | csdr dsb_fc | csdr bandpass_fir_fft_cc 0.002 0.06 0.01 | csdr fastagc_ff | sudo /home/pi/rpitx/sendiq -i /dev/stdin -s 96000 -f 434.9e6 -t float &")
 				system("sudo nc -l 8080 | csdr convert_i16_f | csdr fir_interpolate_cc 2 | csdr dsb_fc | csdr bandpass_fir_fft_cc 0.002 0.06 0.01 | csdr fastagc_ff | sudo /home/pi/rpitx/sendiq -i /dev/stdin -s 96000 -f " + tx + "e6 -t float &")
@@ -829,6 +833,10 @@ if __name__ == "__main__":
 			print("turn on FM rx")
 			output(pd, 1)
 			output(ptt, 1)
+			
+			GPIO.setmode(GPIO.BCM)  # added to make Tx LED work on Pi 4
+			GPIO.setup(txLed, GPIO.OUT)
+			
 			if (command_tx == True):
 				system("sudo nc -l 8080 | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo /home/pi/rpitx/rpitx -i- -m RF -f " + tx + "e3 &")
 			print("Turning LED on/off and listening for carrier")