diff --git a/tests/test_filter_filtering.py b/tests/test_filter_filtering.py
index 3c2b1d8c9..6ec2bfab2 100644
--- a/tests/test_filter_filtering.py
+++ b/tests/test_filter_filtering.py
@@ -88,7 +88,8 @@ def test_filter_by_min_date(self, tmpdir):
         data = [("strain","date"),
                 ("SEQ_1","2020-02-XX"),
                 ("SEQ_2","2020-02-26"),
-                ("SEQ_3","2020-02-25")]
+                ("SEQ_3","2020-02-25"),
+                ("SEQ_4","?")]
         args = get_valid_args(data, tmpdir)
         args.min_date = '2020-02-26'
         filter_obj = get_filter_obj_run(args)
@@ -97,14 +98,15 @@ def test_filter_by_min_date(self, tmpdir):
             FROM {METADATA_FILTER_REASON_TABLE_NAME}
             WHERE {FILTER_REASON_COL} = 'filter_by_min_date'
         """)
-        assert results == [("SEQ_3",)]
+        assert results == [("SEQ_3",), ("SEQ_4",)]
 
     def test_filter_by_max_date(self, tmpdir):
         """Filter by max date, inclusive."""
         data = [("strain","date"),
                 ("SEQ_1","2020-03-XX"),
                 ("SEQ_2","2020-03-01"),
-                ("SEQ_3","2020-03-02")]
+                ("SEQ_3","2020-03-02"),
+                ("SEQ_4","?")]
         args = get_valid_args(data, tmpdir)
         args.max_date = '2020-03-01'
         filter_obj = get_filter_obj_run(args)
@@ -113,7 +115,7 @@ def test_filter_by_max_date(self, tmpdir):
             FROM {METADATA_FILTER_REASON_TABLE_NAME}
             WHERE {FILTER_REASON_COL} = 'filter_by_max_date'
         """)
-        assert results == [("SEQ_3",)]
+        assert results == [("SEQ_3",), ("SEQ_4",)]
 
     def test_filter_by_ambiguous_date_year(self, tmpdir):
         """Filter out dates with ambiguous year."""