diff --git a/tests/backend/app/modelling/test_property_filters.py b/tests/backend/app/modelling/test_property_filters.py
index 613200dba..6b3e62685 100644
--- a/tests/backend/app/modelling/test_property_filters.py
+++ b/tests/backend/app/modelling/test_property_filters.py
@@ -47,3 +47,20 @@ def test_no_filters_resolves_the_whole_portfolio_minus_deletions(
     # assert
     assert resolved == [FilteredProperty(property_id=kept, postcode="B93 8SU")]
     assert deleted not in [p.property_id for p in resolved]
+
+
+def test_postcode_filter_matches_exactly(db_engine: Engine) -> None:
+    # arrange
+    with Session(db_engine) as session:
+        in_area = _seed_property(session, portfolio_id=814, postcode="B93 8SU")
+        _elsewhere = _seed_property(session, portfolio_id=814, postcode="M20 4TF")
+
+        # act
+        resolved = resolve_filtered_property_ids(
+            session,
+            portfolio_id=814,
+            filters=PropertyGroupFilters(postcodes=["B93 8SU"]),
+        )
+
+    # assert
+    assert [p.property_id for p in resolved] == [in_area]