diff --git a/package.json b/package.json
index eb72e7b..b483eb6 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
     "validate": "./node_modules/.bin/gl-style-validate style.json",
-    "diff": "diff <(./node_modules/.bin/gl-style-format style.json) style.json",
+    "diff": "bash -c 'diff <(./node_modules/.bin/gl-style-format style.json) style.json'",
     "format": "./node_modules/.bin/gl-style-format style.json | ./node_modules/.bin/sponge style.json"
   },
   "repository": {