diff --git a/.github/util/initialize/action.yml b/.github/util/initialize/action.yml
index 780e34487..ba37f9376 100644
--- a/.github/util/initialize/action.yml
+++ b/.github/util/initialize/action.yml
@@ -51,16 +51,21 @@ runs:
       uses: sass/clone-linked-repo@v1
       with: {repo: sass/sass, path: build/language}
 
+    # Git is not pre-installed on windows-arm64 runner, however actions/checkout support
+    # downloading repo via GitHub API.
+    - name: Check out the language repo
+      if: github.event_name != 'pull_request'
+      uses: actions/checkout@v4
+      with: {repository: sass/sass, path: build/language}
+
     - name: Generate Dart from protobuf
       if: runner.os != 'Windows'
       run: dart run grinder protobuf
-      env:
-        UPDATE_SASS_SASS_REPO: ${{ github.event_name == 'pull_request' && 'false' || 'true' }}
+      env: {UPDATE_SASS_SASS_REPO: false}
       shell: bash
 
     - name: Generate Dart from protobuf
       if: runner.os == 'Windows'
       run: dart run grinder protobuf
-      env:
-        UPDATE_SASS_SASS_REPO: ${{ github.event_name == 'pull_request' && 'false' || 'true' }}
+      env: {UPDATE_SASS_SASS_REPO: false}
       shell: powershell