diff --git a/tests/hdx/location/test_currency.py b/tests/hdx/location/test_currency.py
index 4cd16bb..a1f9be5 100755
--- a/tests/hdx/location/test_currency.py
+++ b/tests/hdx/location/test_currency.py
@@ -563,3 +563,6 @@ def test_get_adjclose(self, retrievers, secondary_historic_url):
         }
         timestamp = Currency._get_int_timestamp(parse_date("2015-12-15"))
         assert Currency._get_adjclose(indicators, "COP", timestamp) == 3270
+
+        Currency._no_historic = True
+        assert Currency._get_adjclose(indicators, "COP", timestamp) is None