diff --git a/build/pdp10-ka/config.202 b/build/pdp10-ka/config.202
index 25433dc9f..56e85fd78 100644
--- a/build/pdp10-ka/config.202
+++ b/build/pdp10-ka/config.202
@@ -238,7 +238,7 @@ DEFOPT KAIMP==1
 DEFOPT IMPUS==306	; ARPA net host number
 DEFOPT IMPUS3==<IPADDR %IP%>	; IP address
 DEFOPT NM%IMP==0	; Subnet mask (doesn't appear to work if set to real mask)
-DEFOPT NCPP==0		; Flush NCP code
+DEFOPT NCPP==1		; Arpanet NCP code
 DEFOPT NNETCH==20.	; # NCP net channels
 DEFOPT INETP==1		; Include Internet code
 DEFOPT TCPP==1		; Include TCP code