diff --git a/install.sh b/install.sh
index a2afbaa..180cccd 100644
--- a/install.sh
+++ b/install.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
-[ "$1" ] || (echo 'Must provide node.js package manager' && exit)
+if [ ! "$1" ]; then
+    echo 'Must provide node.js package manager'
+    exit
+fi
 
 git clone 'git@github.com:wix/import-cost.git' || (echo 'Failed to clone wix/import-cost' && exit)