diff --git a/pkg/core/native/policy.go b/pkg/core/native/policy.go
index 04ff6a72a..221a94de6 100644
--- a/pkg/core/native/policy.go
+++ b/pkg/core/native/policy.go
@@ -38,7 +38,7 @@ var (
 	// blockedAccountsKey is a key used to store the list of blocked accounts.
 	blockedAccountsKey = []byte{15}
 	// maxBlockSizeKey is a key used to store the maximum block size value.
-	maxBlockSizeKey = []byte{16}
+	maxBlockSizeKey = []byte{12}
 )
 
 // Policy represents Policy native contract.