diff --git a/FWCore/FWLite/test/ref_t.cppunit.cpp b/FWCore/FWLite/test/ref_t.cppunit.cpp
index 865be3ca8e929..4b5aaff90165a 100644
--- a/FWCore/FWLite/test/ref_t.cppunit.cpp
+++ b/FWCore/FWLite/test/ref_t.cppunit.cpp
@@ -216,6 +216,7 @@ void testRefInROOT::testGoodChain() {
   TChain eventChain(edm::poolNames::eventTreeName().c_str());
   eventChain.Add("good.root");
   eventChain.Add("good_delta5.root");
+  eventChain.LoadTree(0);
 
   edm::Wrapper<edmtest::OtherThingCollection>* pOthers = nullptr;
   TBranch* othersBranch = nullptr;