diff --git a/core/blockchain_reader.go b/core/blockchain_reader.go
index 0b9689b8bd..831f59facc 100644
--- a/core/blockchain_reader.go
+++ b/core/blockchain_reader.go
@@ -329,12 +329,9 @@ func (bc *BlockChain) GetAncestor(hash common.Hash, number, ancestor uint64, max
 // access altogether.
 func (bc *BlockChain) HasCanonicalTransaction(hash common.Hash, cacheOnly bool) bool {
 	// Check in memory cache first
-	bc.txLookupLock.RLock()
 	if _, exist := bc.txLookupCache.Get(hash); exist {
-		bc.txLookupLock.RUnlock()
 		return true
 	}
-	bc.txLookupLock.RUnlock()
 
 	// Fallback to database lookup, without reading the transaction itself
 	if !cacheOnly && rawdb.HasCanonicalTransaction(bc.db, hash) {