diff --git a/Makefile.am b/Makefile.am
index 9e360926..31449727 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -11,38 +11,3 @@ nobase_include_HEADERS = \
 		msgpack/unpack_define.h \
 		msgpack/unpack_template.h
 
-EXTRA_DIST = \
-	ruby/bench.rb \
-	ruby/extconf.rb \
-	ruby/gem/README \
-	ruby/gem/Rakefile \
-	ruby/gem/test/test_helper.rb \
-	ruby/gengem.sh \
-	ruby/msgpack.gemspec \
-	ruby/pack.c \
-	ruby/pack.h \
-	ruby/rbinit.c \
-	ruby/test_case.rb \
-	ruby/test_format.rb \
-	ruby/test_pack.rb \
-	ruby/unpack.c \
-	ruby/unpack.h \
-	perl/Makefile.PL \
-	perl/MessagePack.c \
-	perl/benchmark/deserialize.pl \
-	perl/benchmark/serialize.pl \
-	perl/lib/Data/MessagePack.pm \
-	perl/lib/Data/MessagePack \
-	perl/lib/Data/MessagePack/Unpacker.pod \
-	perl/pack.c \
-	perl/ppport.h \
-	perl/t/00_compile.t \
-	perl/t/01_pack.t \
-	perl/t/02_unpack.t \
-	perl/t/03_stream_unpack.t \
-	perl/t/04_invert.t \
-	perl/t/Util.pm \
-	perl/t/data.pl \
-	perl/unpack.c \
-	perl/xt/99_pod.t
-