diff --git a/core/txpool/legacypool/legacypool.go b/core/txpool/legacypool/legacypool.go
index 1bfc6e60b2..15a264a0be 100644
--- a/core/txpool/legacypool/legacypool.go
+++ b/core/txpool/legacypool/legacypool.go
@@ -1639,7 +1639,7 @@ func (as *accountSet) flatten() []common.Address {
 
 // merge adds all addresses from the 'other' set into 'as'.
 func (as *accountSet) merge(other *accountSet) {
-	maps.Copy(as.accounts, other.accounts)
+	as.accounts = other.accounts
 	as.cache = nil
 }