diff --git a/Ledger.cpp b/Ledger.cpp
index d09612f17c..dd3883d42d 100644
--- a/Ledger.cpp
+++ b/Ledger.cpp
@@ -468,7 +468,9 @@ Ledger::pointer Ledger::switchPreviousLedger(Ledger::pointer oldPrevious, Ledger
 			if(!tx || newLedger->addTransaction(tx))
 			{
 				count++;
-				TxnDiff.erase(++it);
+				std::map<uint256, std::pair<Transaction::pointer, Transaction::pointer> >::iterator it2=it;
+				++it;
+				TxnDiff.erase(it2);
 			}
 			else ++it;
 		}
@@ -492,7 +494,9 @@ Ledger::pointer Ledger::switchPreviousLedger(Ledger::pointer oldPrevious, Ledger
 			if(newLedger->addTransaction(it->second))
 			{
 				count++;
-				txnMap.erase(++it);
+				std::map<uint256, Transaction::pointer>::iterator it2=it;
+				++it;
+				txnMap.erase(it2);
 			}
 			else ++it;
 		}