diff --git a/homeassistant/components/fan/__init__.py b/homeassistant/components/fan/__init__.py
index 789299bd1ac..90a3d030703 100644
--- a/homeassistant/components/fan/__init__.py
+++ b/homeassistant/components/fan/__init__.py
@@ -144,6 +144,7 @@ class FanEntity(ToggleEntity):
 
     def oscillate(self, oscillating: bool) -> None:
         """Oscillate the fan."""
+        raise NotImplementedError()
 
     async def async_oscillate(self, oscillating: bool):
         """Oscillate the fan."""
diff --git a/tests/components/fan/test_init.py b/tests/components/fan/test_init.py
index c481e9f0937..a8beed73a07 100644
--- a/tests/components/fan/test_init.py
+++ b/tests/components/fan/test_init.py
@@ -20,7 +20,8 @@ def test_fanentity():
     assert fan.supported_features == 0
     assert fan.capability_attributes == {}
     # Test set_speed not required
-    fan.oscillate(True)
+    with pytest.raises(NotImplementedError):
+        fan.oscillate(True)
     with pytest.raises(NotImplementedError):
         fan.set_speed("slow")
     with pytest.raises(NotImplementedError):