diff --git a/build.sh b/build.sh
index 0184d37..a7b2c88 100755
--- a/build.sh
+++ b/build.sh
@@ -47,8 +47,13 @@ mkdir -p debian/usr/lib/nw.js
 trap "clean_exit" 2
 
 # Download binary
-echo "Downloading and unpacking $URL"
-wget -q -O- $URL | tar -xvz --strip 1 -C debian/usr/lib/nw.js
+if [[ $URL == http*://* ]] ; then
+	echo "Downloading and unpacking $URL"
+	wget -q -O- $URL | tar -xvz --strip 1 -C debian/usr/lib/nw.js
+else
+	echo "Unpacking local file $URL"
+	tar -xvz --strip 1 -C debian/usr/lib/nw.js -f $URL
+fi
 
 echo "Packaging deb file"
 dpkg-deb -b debian "out/$FILENAME"