diff --git a/package.json b/package.json
index ce7a4c9b7e42611104144e2fdec3426492234ac7..56b36a75bc836853a680a4f408dcf2da0a1772a5 100644
--- a/package.json
+++ b/package.json
@@ -145,7 +145,7 @@
     "build-hot": "NODE_ENV=hot webpack --bail && NODE_ENV=hot webpack-dev-server --progress",
     "start": "yarn run build && lein ring server",
     "storybook": "start-storybook -p 9001",
-    "preinstall": "ps -fp $PPID | grep -q yarn || echo '\\033[0;33mSorry, npm is not supported. Please use Yarn (https://yarnpkg.com/).\\033[0m'",
+    "preinstall": "echo $npm_execpath | grep -q yarn || echo '\\033[0;33mSorry, npm is not supported. Please use Yarn (https://yarnpkg.com/).\\033[0m'",
     "test-jest": "jest"
   },
   "jest": {