diff --git a/direwolf/direwolf-pacsatsim-pwm.conf b/direwolf/direwolf-pacsatsim-pwm.conf
index 58667777..65a5bcc3 100644
--- a/direwolf/direwolf-pacsatsim-pwm.conf
+++ b/direwolf/direwolf-pacsatsim-pwm.conf
@@ -1,6 +1,6 @@
 #ADEVICE plughw:CARD=Device,DEV=0 plughw:CARD=Headphones,DEV=0
 ADEVICE shared_mic plughw:CARD=Headphones,DEV=0 
-PTT GPIO -20  
+PTT GPIOD piochip0 -20  
 MYCALL AMSAT-12
 CHANNEL 0
 MODEM 1200