diff --git a/source/ledger/ledger-core/src/main/java/com/jd/blockchain/ledger/core/handles/DataAccountKVSetOperationHandle.java b/source/ledger/ledger-core/src/main/java/com/jd/blockchain/ledger/core/handles/DataAccountKVSetOperationHandle.java
index b597f327..4a8209b2 100644
--- a/source/ledger/ledger-core/src/main/java/com/jd/blockchain/ledger/core/handles/DataAccountKVSetOperationHandle.java
+++ b/source/ledger/ledger-core/src/main/java/com/jd/blockchain/ledger/core/handles/DataAccountKVSetOperationHandle.java
@@ -35,7 +35,7 @@ public class DataAccountKVSetOperationHandle extends AbstractLedgerOperationHand
 			throw new DataAccountDoesNotExistException("DataAccount doesn't exist!");
 		}
 		KVWriteEntry[] writeSet = kvWriteOp.getWriteSet();
-		long v = -1;
+		long v = -1L;
 		for (KVWriteEntry kvw : writeSet) {
 			v = account.setBytes(Bytes.fromString(kvw.getKey()), kvw.getValue(), kvw.getExpectedVersion());
 			if (v < 0) {