diff --git a/pkg/owner/wallet.go b/pkg/owner/wallet.go
index 80fb8898..8777cdef 100644
--- a/pkg/owner/wallet.go
+++ b/pkg/owner/wallet.go
@@ -10,7 +10,10 @@ import (
 )
 
 // NEO3Wallet represents NEO3 wallet address.
-type NEO3Wallet [25]byte
+type NEO3Wallet [NEO3WalletSize]byte
+
+// NEO3WalletSize contains size of neo3 wallet.
+const NEO3WalletSize = 25
 
 // NEO3WalletFromPublicKey converts public key to NEO3 wallet address.
 func NEO3WalletFromPublicKey(key *ecdsa.PublicKey) (*NEO3Wallet, error) {