diff --git a/web/core/views.py b/web/core/views.py
index 3ad0001..8c0610e 100644
--- a/web/core/views.py
+++ b/web/core/views.py
@@ -359,7 +359,8 @@ def import_wizard(request):
                 # If the first row doesn’t look like our header, allow import to proceed,
                 # but show a gentle warning in the result page.
                 header_ok = (norm == expected_norm)
-
+                if not hasattr(core_utils, "EXPECTED_HEADERS"):
+                    core_utils.EXPECTED_HEADERS = _EXPECTED_HEADERS
                 # hand off to your existing robust importer
                 report = import_csv_bytes(
                     raw,