diff --git a/contracts/coins/ArbethWalletSimple.sol b/contracts/coins/ArbethWalletSimple.sol
index 5f62da3..0fe579c 100644
--- a/contracts/coins/ArbethWalletSimple.sol
+++ b/contracts/coins/ArbethWalletSimple.sol
@@ -44,7 +44,7 @@ contract ArbethWalletSimple is WalletSimple {
    * This provides protection signatures being replayed on other chains
    */
   function getTokenNetworkId() internal override view returns (string memory) {
-    return string.concat(Strings.toString(block.chainid), 'ERC20');
+    return string.concat(Strings.toString(block.chainid), '-ERC20');
   }
 
   /**
@@ -52,6 +52,6 @@ contract ArbethWalletSimple is WalletSimple {
    * This provides protection signatures being replayed on other chains
    */
   function getBatchNetworkId() internal override view returns (string memory) {
-    return string.concat(Strings.toString(block.chainid), 'Batch');
+    return string.concat(Strings.toString(block.chainid), '-Batch');
   }
 }
diff --git a/contracts/coins/OpethWalletSimple.sol b/contracts/coins/OpethWalletSimple.sol
index 5e0ef7d..69462a9 100644
--- a/contracts/coins/OpethWalletSimple.sol
+++ b/contracts/coins/OpethWalletSimple.sol
@@ -44,7 +44,7 @@ contract ArbethWalletSimple is WalletSimple {
    * This provides protection signatures being replayed on other chains
    */
   function getTokenNetworkId() internal override view returns (string memory) {
-    return string.concat(Strings.toString(block.chainid), 'ERC20');
+    return string.concat(Strings.toString(block.chainid), '-ERC20');
   }
 
   /**
@@ -52,6 +52,6 @@ contract ArbethWalletSimple is WalletSimple {
    * This provides protection signatures being replayed on other chains
    */
   function getBatchNetworkId() internal override view returns (string memory) {
-    return string.concat(Strings.toString(block.chainid), 'Batch');
+    return string.concat(Strings.toString(block.chainid), '-Batch');
   }
 }