diff --git a/docs/installation.md b/docs/installation.md
index a89d838..c5b6c52 100644
--- a/docs/installation.md
+++ b/docs/installation.md
@@ -41,7 +41,7 @@ Now we tell `composer` to download the `pup.phar` file into the `bin/` directory
 ```json
 "scripts": {
       "pup": [
-              "test -f ./bin/pup.phar || curl -o bin/pup.phar -L -C - https://github.com/stellarwp/pup/releases/download/VERSION/pup.phar",
+              "sh -c 'test -f ./bin/pup.phar || curl -o bin/pup.phar -L -C - https://github.com/stellarwp/pup/releases/download/VERSION/pup.phar'",
               "@php ./bin/pup.phar"
       ]
 }
@@ -87,4 +87,4 @@ cd pup
 composer install
 ```
 
-Optionally, you can add the `pup` directory to your `$PATH`.
\ No newline at end of file
+Optionally, you can add the `pup` directory to your `$PATH`.