diff --git a/xonsh/alias.xsh b/xonsh/alias.xsh
index 507ba63..09126eb 100644
--- a/xonsh/alias.xsh
+++ b/xonsh/alias.xsh
@@ -1,3 +1,5 @@
+from xonsh.platform import ON_DARWIN
+
 aliases["-"] = "cd -"
 aliases[".."] = "cd .."
 aliases["..."] = "cd ../.."