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-rw-r--r--src/txmempool.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index 1c16e2092e..2292191be4 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -166,7 +166,7 @@ void CTxMemPool::removeCoinbaseSpends(const CCoinsViewCache *pcoins, unsigned in
continue;
const CCoins *coins = pcoins->AccessCoins(txin.prevout.hash);
if (fSanityCheck) assert(coins);
- if (!coins || (coins->IsCoinBase() && nMemPoolHeight - coins->nHeight < COINBASE_MATURITY)) {
+ if (!coins || (coins->IsCoinBase() && ((signed long)nMemPoolHeight) - coins->nHeight < COINBASE_MATURITY)) {
transactionsToRemove.push_back(tx);
break;
}