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-rw-r--r--src/policy/fees.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/policy/fees.h b/src/policy/fees.h
index 7abd1d43a1..e11a6582a4 100644
--- a/src/policy/fees.h
+++ b/src/policy/fees.h
@@ -8,6 +8,7 @@
#include "amount.h"
#include "uint256.h"
#include "random.h"
+#include "sync.h"
#include <map>
#include <string>
@@ -249,6 +250,8 @@ private:
unsigned int trackedTxs;
unsigned int untrackedTxs;
+ mutable CCriticalSection cs_feeEstimator;
+
/** Process a transaction confirmed in a block*/
bool processBlockTx(unsigned int nBlockHeight, const CTxMemPoolEntry* entry);