diff --git a/configfsf.sub b/configfsf.sub
index 2cd44cb1..9b62dbf4 100755
--- a/configfsf.sub
+++ b/configfsf.sub
@@ -1104,7 +1104,7 @@ case $basic_machine in
 	pmac | pmac-mpw)
 		basic_machine=powerpc-apple
 		;;
-	*-unknown)
+	*-unknown | *-pc)
 		# Make sure to match an already-canonicalized machine name.
 		;;
 	*)