diff --git a/ironic/tests/base.py b/ironic/tests/base.py
index a7d098c6dd..7282a5fd06 100644
--- a/ironic/tests/base.py
+++ b/ironic/tests/base.py
@@ -119,15 +119,6 @@ class WarningsFixture(fixtures.Fixture):
             category=sqla_exc.SAWarning,
         )
 
-        # FIXME(stephenfin): We can remove this once oslo.db is fixed
-        # https://review.opendev.org/c/openstack/oslo.db/+/856453
-        warnings.filterwarnings(
-            'ignore',
-            module='ironic',
-            message='TypeDecorator .* will not produce a cache key',
-            category=sqla_exc.SAWarning,
-        )
-
         self.addCleanup(self._reset_warning_filters)
 
     def _reset_warning_filters(self):