diff --git a/src/cpp/ripple/LedgerHistory.h b/src/cpp/ripple/LedgerHistory.h
index 1709e5954a..965ac492a1 100644
--- a/src/cpp/ripple/LedgerHistory.h
+++ b/src/cpp/ripple/LedgerHistory.h
@@ -15,6 +15,7 @@ public:
 	void addLedger(Ledger::pointer ledger);
 	void addAcceptedLedger(Ledger::pointer ledger, bool fromConsensus);
 
+	uint256 getLedgerHash(uint32 index);
 	Ledger::pointer getLedgerBySeq(uint32 index);
 	Ledger::pointer getLedgerByHash(const uint256& hash);
 	Ledger::pointer canonicalizeLedger(Ledger::pointer, bool cache);