diff --git a/contracts/examples/SimpleSavingsWallet.sol b/contracts/examples/SimpleSavingsWallet.sol
index 2b7e553c1..99370a471 100644
--- a/contracts/examples/SimpleSavingsWallet.sol
+++ b/contracts/examples/SimpleSavingsWallet.sol
@@ -24,7 +24,7 @@ contract SimpleSavingsWallet is Heritable {
   /**
    * @dev wallet can receive funds.
    */
-  function () public payable {
+  function () external payable {
     emit Received(msg.sender, msg.value, address(this).balance);
   }
 
diff --git a/contracts/payment/SplitPayment.sol b/contracts/payment/SplitPayment.sol
index 67d9db840..f3e9107a6 100644
--- a/contracts/payment/SplitPayment.sol
+++ b/contracts/payment/SplitPayment.sol
@@ -32,7 +32,7 @@ contract SplitPayment {
   /**
    * @dev payable fallback
    */
-  function () public payable {}
+  function () external payable {}
 
   /**
    * @dev Claim your share of the balance.