diff --git a/src/LedgerMaster.cpp b/src/LedgerMaster.cpp
index 6d72b2d0ec..12002a74bf 100644
--- a/src/LedgerMaster.cpp
+++ b/src/LedgerMaster.cpp
@@ -36,6 +36,17 @@ void LedgerMaster::pushLedger(Ledger::pointer newLedger)
 	mEngine.setLedger(newLedger);
 }
 
+void LedgerMaster::switchLedgers(Ledger::pointer lastClosed, Ledger::pointer current)
+{
+	mFinalizedLedger = lastClosed;
+	mFinalizedLedger->setClosed();
+	mFinalizedLedger->setAccepted();
+
+	mCurrentLedger = current;
+	assert(!mCurrentLedger->isClosed());
+	mEngine.setLedger(mCurrentLedger);
+}
+
 #if 0
 
 void LedgerMaster::startFinalization()
diff --git a/src/LedgerMaster.h b/src/LedgerMaster.h
index 07c8907ed0..8caa1012e2 100644
--- a/src/LedgerMaster.h
+++ b/src/LedgerMaster.h
@@ -45,6 +45,7 @@ public:
 	{ return mEngine.applyTransaction(txn, params); }
 
 	void pushLedger(Ledger::pointer newLedger);
+	void switchLedgers(Ledger::pointer lastClosed, Ledger::pointer newCurrent);
 
 	Ledger::pointer getLedgerBySeq(uint32 index)
 	{