diff --git a/contracts/examples/BadPushPayments.sol b/contracts/examples/BadPushPayments.sol
index 2d85ffeec..7bc11c665 100644
--- a/contracts/examples/BadPushPayments.sol
+++ b/contracts/examples/BadPushPayments.sol
@@ -7,7 +7,7 @@ contract BadPushPayments {
 	address highestBidder;
 	uint highestBid;
 
-	function bid() {
+	function bid() payable {
 		if (msg.value < highestBid) throw;
 
 		if (highestBidder != 0) {
diff --git a/contracts/examples/GoodPullPayments.sol b/contracts/examples/GoodPullPayments.sol
index 1469eb57f..fc0cd986b 100644
--- a/contracts/examples/GoodPullPayments.sol
+++ b/contracts/examples/GoodPullPayments.sol
@@ -6,7 +6,7 @@ contract GoodPullPayments {
   uint highestBid;
   mapping(address => uint) refunds;
 
-  function bid() external {
+  function bid() external payable {
     if (msg.value < highestBid) throw;
 
     if (highestBidder != 0) {
diff --git a/contracts/examples/PullPaymentBid.sol b/contracts/examples/PullPaymentBid.sol
index ad4b612b5..8ba51422f 100644
--- a/contracts/examples/PullPaymentBid.sol
+++ b/contracts/examples/PullPaymentBid.sol
@@ -8,7 +8,7 @@ contract PullPaymentBid is PullPayment {
   address public highestBidder;
   uint public highestBid;
   
-  function bid() external {
+  function bid() external payable {
     if (msg.value <= highestBid) throw;
     
     if (highestBidder != 0) {
diff --git a/contracts/examples/StoppableBid.sol b/contracts/examples/StoppableBid.sol
index 61b9d43aa..53e1aebdc 100644
--- a/contracts/examples/StoppableBid.sol
+++ b/contracts/examples/StoppableBid.sol
@@ -9,7 +9,7 @@ contract StoppableBid is Stoppable, PullPayment {
   address public highestBidder;
   uint public highestBid;
 
-  function bid() external stopInEmergency {
+  function bid() external payable stopInEmergency {
     if (msg.value <= highestBid) throw;
     
     if (highestBidder != 0) {