diff --git a/make.conf.corka b/make.conf.corka
index 9a0bb70..a65bbd4 100644
--- a/make.conf.corka
+++ b/make.conf.corka
@@ -17,7 +17,7 @@ ftp://xeon.gentoo.ru/mirrors/gentoo/distfiles/"
 SYNC="git://git.calculate.ru/calculate/portage.git"
 RUBY_TARGETS="ruby18"
 # cpu
-USE="$USE -3dnow -3dnowext fpu mmx -mmxext smp \
+USE="${USE} -3dnow -3dnowext fpu mmx -mmxext smp \
           sse sse2 sse3 ssse3 -sse4a sse4 sse41 sse4_1 sse42 sse4_2"
 # gpu
-USE="$USE nvidia vdpau"
+USE="${USE} nvidia vdpau"