diff --git a/index.js b/index.js
index 0292b03..ba58693 100644
--- a/index.js
+++ b/index.js
@@ -153,7 +153,7 @@
         err = null;
 
       // Spawn du process qui vérifie la présence du paquet
-      var child = child_process.spawn('which', item, {
+      var child = child_process.spawn('which', [item], {
         cwd: __dirname
       });