diff --git a/install_sys.sh b/install_sys.sh
index d045dd9..b1ed29d 100644
--- a/install_sys.sh
+++ b/install_sys.sh
@@ -41,8 +41,8 @@ chroot $CHROOT /bin/bash -c "emerge sudo --getbinpkgonly"
 chroot $CHROOT /bin/bash -c "emerge grub --getbinpkgonly"
 
 #installer le noyaux
-tar $CHROOT/kernel.tar.bz2 -C $CHROOT/
-tar $CHROOT/modules.tar.bz2 -C /lib/modules/
+tar xjpf $CHROOT/kernel.tar.bz2 -C $CHROOT/
+tar xjpf $CHROOT/modules.tar.bz2 -C /lib/modules/
 
 #configurer grub
 chroot $CHROOT /bin/bash -c "grub-install /dev/sda"