diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 820d491..d5076e2 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -16,14 +16,14 @@ jobs:
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
         with:
-          ref: ${{ github.head_ref }} # Required to push commit to PR
+          fetch-depth: 0 # Required to show diff between PR source and target branches
+          ref: ${{ github.head_ref }} # Required to push commit to PR source branch
 
       - name: Build Bicep file
         id: build
         shell: bash {0} # Required to check exit code
         run: |
-          git fetch origin "$GITHUB_BASE_REF"
-          git diff --exit-code --merge-base "origin/$GITHUB_BASE_REF" "$BICEP_FILE_PATH"
+          git diff --exit-code --merge-base "$GITHUB_BASE_REF" "$BICEP_FILE_PATH"
           exit_code="$?"
           if [[ "$exit_code" == 0 ]]; then
             echo "No changes made to Bicep file. Skipping build."