diff --git a/homeassistant/components/knx/fan.py b/homeassistant/components/knx/fan.py
index f787795e1e8..21ede700fdd 100644
--- a/homeassistant/components/knx/fan.py
+++ b/homeassistant/components/knx/fan.py
@@ -66,9 +66,6 @@ class KNXFan(KnxEntity, FanEntity):
         # FanSpeedMode.STEP if max_step is set
         self._step_range: tuple[int, int] | None = (1, max_step) if max_step else None
 
-        self._attr_supported_features = SUPPORT_SET_SPEED
-        if self._device.supports_oscillation:
-            self._attr_supported_features |= SUPPORT_OSCILLATE
         self._attr_unique_id = str(self._device.speed.group_address)
 
     async def async_set_percentage(self, percentage: int) -> None:
@@ -79,6 +76,16 @@ class KNXFan(KnxEntity, FanEntity):
         else:
             await self._device.set_speed(percentage)
 
+    @property
+    def supported_features(self) -> int:
+        """Flag supported features."""
+        flags = SUPPORT_SET_SPEED
+
+        if self._device.supports_oscillation:
+            flags |= SUPPORT_OSCILLATE
+
+        return flags
+
     @property
     def percentage(self) -> int | None:
         """Return the current speed as a percentage."""