diff --git a/.github/workflows/npm-published-simulation.yml b/.github/workflows/npm-published-simulation.yml
index 915430a2a5bb..8af226733e1c 100644
--- a/.github/workflows/npm-published-simulation.yml
+++ b/.github/workflows/npm-published-simulation.yml
@@ -55,7 +55,7 @@ jobs:
           REACT_APP_DISABLE_AUTH: true
           CONTENT_ROOT: testing/content/files
         run: |
-          yarn build:prepare
+          yarn build:legacy:prepare
 
       - name: Build and install tarball
         run: |
diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 7ad7cc562f97..f59fa3a0f224 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -89,7 +89,7 @@ jobs:
         env:
           ENV_FILE: .env.testing
         run: |
-          yarn build:prepare
+          yarn build:legacy:prepare
           yarn build:legacy
           yarn render:html