diff --git a/setup.py b/setup.py
index 9ac6dab..b1067f5 100755
--- a/setup.py
+++ b/setup.py
@@ -67,7 +67,7 @@ class install_data(module_install_data.install_data):
                             os.chmod(out,chmod)
                         self.outfiles.append(out)
 
-data_files = [('/usr/libexec/calculate', [('data/cl-git-wrapper', 0755)])]
+data_files = [('/usr/libexec/calculate', [('data/cl-git-wrapper', 0o755)])]
 
 packages = [
     "calculate."+str('.'.join(root.split(os.sep)[1:]))