diff --git a/src/main.cpp b/src/main.cpp
index b841ef09b..8b9c6bb17 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3105,6 +3105,7 @@ bool ActivateBestChain(CValidationState &state, const CChainParams& chainparams,
 
         const CBlockIndex *pindexFork;
         bool fInitialDownload;
+        int nNewHeight;
         {
             LOCK(cs_main);
             CBlockIndex *pindexOldTip = chainActive.Tip();