diff --git a/core/rawdb/accessors_metadata.go b/core/rawdb/accessors_metadata.go
index c9ae50aeb85f..3302f0d81fae 100644
--- a/core/rawdb/accessors_metadata.go
+++ b/core/rawdb/accessors_metadata.go
@@ -43,7 +43,7 @@ func WriteDatabaseVersion(db ethdb.KeyValueWriter, vsn int) {
 
 // ReadChainConfig will fetch the network settings based on the given hash.
 func ReadChainConfig(db DatabaseReader, hash common.Hash) (*params.ChainConfig, error) {
-	jsonChainConfig, _ := db.Get(append(configPrefix, hash[:]...))
+	jsonChainConfig, _ := db.Get(configKey(hash))
 	if len(jsonChainConfig) == 0 {
 		return nil, errors.New("ChainConfig not found") // general config not found error
 	}
diff --git a/core/rawdb/schema.go b/core/rawdb/schema.go
index 3fa28409bd31..2137956d1086 100644
--- a/core/rawdb/schema.go
+++ b/core/rawdb/schema.go
@@ -122,3 +122,8 @@ func txLookupKey(hash common.Hash) []byte {
 func preimageKey(hash common.Hash) []byte {
 	return append(preimagePrefix, hash.Bytes()...)
 }
+
+// configKey = configPrefix + hash
+func configKey(hash common.Hash) []byte {
+	return append(configPrefix, hash.Bytes()...)
+}