diff --git a/build.sh b/build.sh
index d3a9879..21afe9b 100755
--- a/build.sh
+++ b/build.sh
@@ -2,7 +2,7 @@
 # Usage: $ build.sh <output-dir
 
 SOURCE_TARBALL='http://www.python.org/ftp/python/2.7.3/Python-2.7.3.tar.bz2'
-curl $SOURCE_TARBALL | tar jxf
+curl $SOURCE_TARBALL | tar jx
 mv Python-2.7.3 src
 cd src