diff --git a/contrib/osx/Tor b/contrib/osx/Tor
index 2365790f4..0660fd7c8 100755
--- a/contrib/osx/Tor
+++ b/contrib/osx/Tor
@@ -34,7 +34,7 @@ if [ -x /usr/bin/sw_vers ]; then
  	"10.0") ARCH="ppc";;
       esac
 else
-	OS="unknown"
+	ARCH="unknown"
 fi
  
 if [ $ARCH != "universal" ]; then