diff --git a/src/robusta/core/sinks/sink_base.py b/src/robusta/core/sinks/sink_base.py
index 28d012f77..6c5262f3c 100644
--- a/src/robusta/core/sinks/sink_base.py
+++ b/src/robusta/core/sinks/sink_base.py
@@ -165,7 +165,7 @@ def stop(self):
     def accepts(self, finding: Finding) -> bool:
         return (
             finding.matches(self.params.match, self.params.scope)
-            and any(time_slice.is_active_now for time_slice in self.time_slices)
+            and any(time_slice.is_active_now() for time_slice in self.time_slices)
         )
 
     @abstractmethod
diff --git a/tests/test_sink_timing.py b/tests/test_sink_timing.py
index b11bbe5e1..01e9313a0 100644
--- a/tests/test_sink_timing.py
+++ b/tests/test_sink_timing.py
@@ -1,6 +1,11 @@
+from unittest.mock import Mock
+
 import pytest
 from freezegun import freeze_time
 
+from robusta.core.reporting import Finding
+from robusta.core.sinks.sink_base import SinkBase
+from robusta.core.sinks.sink_base_params import ActivityParams
 from robusta.core.sinks.timing import TimeSlice
 
 
@@ -32,3 +37,32 @@ def test_invalid_days(self):
     def test_invalid_time(self, time):
         with pytest.raises(ValueError):
             TimeSlice([], [time], "UTC")
+
+
+class _TestSinkBase(SinkBase):
+    def write_finding(self, finding: Finding, platform_enabled: bool):
+        pass
+
+    def create_summary_header(self):
+        pass
+
+    def _build_time_slices_from_params(self, params: ActivityParams):
+        # We'll construct time_slices explicitly below in TestSinkBase.test_accepts
+        pass
+
+
+class TestSinkBase:
+    @pytest.mark.parametrize(
+        "days,time_intervals,expected_result",
+        [
+            (["mon", "tue"], [("10:10", "11:05"), ("13:05", "13:50")], False),
+            (["Sun", "Wed"], [("13:30", "14:00"), ("19:01", "21:30")], True),
+        ]
+    )
+    def test_accepts(self, days, time_intervals, expected_result):
+        mock_registry = Mock(get_global_config=lambda: Mock())
+        sink = _TestSinkBase(registry=mock_registry, sink_params=Mock())
+        sink.time_slices = [TimeSlice(days, time_intervals, "UTC")]
+        mock_finding = Mock(matches=Mock(return_value=True))
+        with freeze_time("2012-01-01 13:45"):  # this is UTC time
+            assert sink.accepts(mock_finding) is expected_result