diff --git a/triedb/pathdb/lookup.go b/triedb/pathdb/lookup.go
index 8b092730f8..99057d668f 100644
--- a/triedb/pathdb/lookup.go
+++ b/triedb/pathdb/lookup.go
@@ -28,8 +28,8 @@ import (
 // storageKey returns a key for uniquely identifying the storage slot.
 func storageKey(accountHash common.Hash, slotHash common.Hash) [64]byte {
 	var key [64]byte
-	copy(key[:32], accountHash[:])
-	copy(key[32:], slotHash[:])
+	*(*[32]byte)(key[32:]) = slotHash
+	*(*[32]byte)(key[:32]) = accountHash
 	return key
 }