diff --git a/make.conf.backbone b/make.conf.backbone
index 4adf96b..1c4424d 100644
--- a/make.conf.backbone
+++ b/make.conf.backbone
@@ -50,7 +50,7 @@ NGINX_MODULES_HTTP="proxy rewrite gzip"
 
 RUBY_TARGETS="ruby18"
 
-USE="mmx mmxext 3dnow sse sse2 custom-cflags fftw alsa unicode bash-completion threads daemon xattr \
+USE="mmx mmxext 3dnow 3dnowext sse sse2 custom-cflags fftw alsa unicode bash-completion threads daemon xattr \
      -X -qt4 -gtk -kde -gnome \
      -cups -debug -python -perl -oss -static-libs \
      -cairo -acl -cli -ffmpeg -gpm -ipv6"