diff --git a/node/impl/full/state.go b/node/impl/full/state.go
index b64e60260..df747ba3f 100644
--- a/node/impl/full/state.go
+++ b/node/impl/full/state.go
@@ -628,7 +628,7 @@ func (a *StateAPI) StateChangedActors(ctx context.Context, old cid.Cid, new cid.
 		return nil, xerrors.Errorf("failed to load new state tree: %w", err)
 	}
 
-	state.Diff(oldTree, newTree)
+	return state.Diff(oldTree, newTree)
 }
 
 func (a *StateAPI) StateMinerSectorCount(ctx context.Context, addr address.Address, tsk types.TipSetKey) (api.MinerSectors, error) {