diff --git a/direwolf/direwolf-pacsatsim-loopback.conf b/direwolf/direwolf-pacsatsim-loopback.conf
index 581d30cb..d1bcf78d 100644
--- a/direwolf/direwolf-pacsatsim-loopback.conf
+++ b/direwolf/direwolf-pacsatsim-loopback.conf
@@ -3,6 +3,6 @@ ADEVICE plughw:CARD=Loopback,DEV=1 plughw:CARD=Loopback,DEV=1
 MYCALL AMSAT-12
 CHANNEL 0
 MODEM 1200
-FULLDUP OFF
+FULLDUP ON
 TXDELAY 15
 #FIX_BITS 1 AX25