diff --git a/.github/workflows/FissionUnitTest.yml b/.github/workflows/FissionUnitTest.yml
index 72ea9968be..b96a801da3 100644
--- a/.github/workflows/FissionUnitTest.yml
+++ b/.github/workflows/FissionUnitTest.yml
@@ -22,6 +22,7 @@ jobs:
       run: |
         cd fission
         npm install
+        npm install -g run-script-os
         npm run assetpack
     - name: Unit Tests
       id: unit-tests