diff --git a/homeassistant/components/siren/__init__.py b/homeassistant/components/siren/__init__.py
index 263c6697df6..29ad238ac00 100644
--- a/homeassistant/components/siren/__init__.py
+++ b/homeassistant/components/siren/__init__.py
@@ -212,4 +212,9 @@ class SirenEntity(ToggleEntity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
     @cached_property
     def supported_features(self) -> SirenEntityFeature:
         """Return the list of supported features."""
-        return self._attr_supported_features
+        features = self._attr_supported_features
+        if type(features) is int:  # noqa: E721
+            new_features = SirenEntityFeature(features)
+            self._report_deprecated_supported_features_values(new_features)
+            return new_features
+        return features
diff --git a/tests/components/siren/test_init.py b/tests/components/siren/test_init.py
index ee007f6f1f5..abc5b0fac38 100644
--- a/tests/components/siren/test_init.py
+++ b/tests/components/siren/test_init.py
@@ -119,3 +119,20 @@ def test_deprecated_constants(
 ) -> None:
     """Test deprecated constants."""
     import_and_test_deprecated_constant_enum(caplog, module, enum, "SUPPORT_", "2025.1")
+
+
+def test_deprecated_supported_features_ints(caplog: pytest.LogCaptureFixture) -> None:
+    """Test deprecated supported features ints."""
+
+    class MockSirenEntity(siren.SirenEntity):
+        _attr_supported_features = 1
+
+    entity = MockSirenEntity()
+    assert entity.supported_features is siren.SirenEntityFeature(1)
+    assert "MockSirenEntity" in caplog.text
+    assert "is using deprecated supported features values" in caplog.text
+    assert "Instead it should use" in caplog.text
+    assert "SirenEntityFeature.TURN_ON" in caplog.text
+    caplog.clear()
+    assert entity.supported_features is siren.SirenEntityFeature(1)
+    assert "is using deprecated supported features values" not in caplog.text