diff --git a/src/validation.h b/src/validation.h
index 981f65963..97fc9df1f 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -73,7 +73,7 @@ static const unsigned int DEFAULT_DESCENDANT_LIMIT = 25;
 /** Default for -limitdescendantsize, maximum kilobytes of in-mempool descendants */
 static const unsigned int DEFAULT_DESCENDANT_SIZE_LIMIT = 101;
 /** Default for -mempoolexpiry, expiration time for mempool transactions in hours */
-static const unsigned int DEFAULT_MEMPOOL_EXPIRY = 72;
+static const unsigned int DEFAULT_MEMPOOL_EXPIRY = 336;
 /** The maximum size of a blk?????.dat file (since 0.8) */
 static const unsigned int MAX_BLOCKFILE_SIZE = 0x8000000; // 128 MiB
 /** The pre-allocation chunk size for blk?????.dat files (since 0.8) */