diff --git a/ext/Setup.atheos b/ext/Setup.atheos
index 6a8b9903af..91f73f32f9 100644
--- a/ext/Setup.atheos
+++ b/ext/Setup.atheos
@@ -13,7 +13,7 @@ io/wait
 nkf
 #openssl
 pty
-racc/cparse
+#racc/cparse
 readline
 ripper
 socket
diff --git a/ext/Setup.nt b/ext/Setup.nt
index 067f153d36..1278f183e4 100644
--- a/ext/Setup.nt
+++ b/ext/Setup.nt
@@ -14,7 +14,7 @@ fcntl
 nkf
 #openssl
 #pty
-racc/cparse
+#racc/cparse
 #readline
 #ripper
 socket