diff --git a/install.sh b/install.sh
index 52ad7ce..5d34419 100755
--- a/install.sh
+++ b/install.sh
@@ -1,6 +1,6 @@
 #! /bin/bash
 
-test -x ./setup.py || exit 1
+test -e ./setup.py || exit 1
 apt-get install python-dev
 pip install --upgrade .