diff --git a/.github/workflows/build-hk-low-vol-snapshot-artifacts.yml b/.github/workflows/build-hk-low-vol-snapshot-artifacts.yml
index 8e27aa4..f3c31d6 100644
--- a/.github/workflows/build-hk-low-vol-snapshot-artifacts.yml
+++ b/.github/workflows/build-hk-low-vol-snapshot-artifacts.yml
@@ -354,7 +354,7 @@ jobs:
         with:
           name: ${{ steps.build.outputs.artifact_name }}
           path: ${{ steps.build.outputs.artifact_dir }}
-          if-no-files-found: ignore
+          if-no-files-found: error
           retention-days: 14
 
       - name: Upload generated input snapshot
@@ -363,7 +363,7 @@ jobs:
         with:
           name: ${{ steps.build.outputs.generated_input_name }}
           path: ${{ steps.build.outputs.generated_input_dir }}
-          if-no-files-found: ignore
+          if-no-files-found: error
           retention-days: 14
 
       - name: Append job summary
diff --git a/tests/test_build_hk_low_vol_snapshot_workflow.py b/tests/test_build_hk_low_vol_snapshot_workflow.py
index 1fc030a..2e652e7 100644
--- a/tests/test_build_hk_low_vol_snapshot_workflow.py
+++ b/tests/test_build_hk_low_vol_snapshot_workflow.py
@@ -41,4 +41,4 @@ def test_hk_low_vol_snapshot_artifact_workflow_keeps_generation_diagnostics():
     assert "failed_symbols_preview" in workflow
     assert '${generation_label} factor snapshot generation failed; see generation_summary.json' in workflow
     assert "if: always() && steps.build.outputs.generated_input_name != ''" in workflow
-    assert "if-no-files-found: ignore" in workflow
+    assert "if-no-files-found: error" in workflow