diff --git a/install.js b/install.js
index 3d2e69e..e761ba9 100644
--- a/install.js
+++ b/install.js
@@ -76,7 +76,7 @@ catch (e) {
   console.error('pre-commit:');
 }
 
-try { fs.chmodSync(precommit, 777); }
+try { fs.chmodSync(precommit, '777'); }
 catch (e) {
   console.error('pre-commit:');
   console.error('pre-commit: chmod 0777 the pre-commit file in your .git/hooks folder because:');