From 27fb51d37ff9f7db7c7deba4e0d3734bfb73c256 Mon Sep 17 00:00:00 2001
From: Lawrence Forman <lawrence@0xproject.com>
Date: Sat, 16 Nov 2019 00:26:01 -0500
Subject: [PATCH] `@0x/contracts-asset-proxy`: Tweak `IUniswapExchangeFactory`.

---
 contracts/asset-proxy/contracts/src/bridges/UniswapBridge.sol | 4 +++-
 .../contracts/src/interfaces/IUniswapExchangeFactory.sol      | 2 +-
 contracts/asset-proxy/contracts/test/TestUniswapBridge.sol    | 4 ++--
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/contracts/asset-proxy/contracts/src/bridges/UniswapBridge.sol b/contracts/asset-proxy/contracts/src/bridges/UniswapBridge.sol
index 6e6d325522..23fb69c47c 100644
--- a/contracts/asset-proxy/contracts/src/bridges/UniswapBridge.sol
+++ b/contracts/asset-proxy/contracts/src/bridges/UniswapBridge.sol
@@ -210,7 +210,9 @@ contract UniswapBridge is
         if (fromTokenAddress == address(getWethContract())) {
             exchangeTokenAddress = toTokenAddress;
         }
-        exchange = getUniswapExchangeFactoryContract().getExchange(exchangeTokenAddress);
+        exchange = IUniswapExchange(
+            getUniswapExchangeFactoryContract().getExchange(exchangeTokenAddress)
+        );
         require(address(exchange) != address(0), "NO_UNISWAP_EXCHANGE_FOR_TOKEN");
         return exchange;
     }
diff --git a/contracts/asset-proxy/contracts/src/interfaces/IUniswapExchangeFactory.sol b/contracts/asset-proxy/contracts/src/interfaces/IUniswapExchangeFactory.sol
index c175f55326..d91c5319d5 100644
--- a/contracts/asset-proxy/contracts/src/interfaces/IUniswapExchangeFactory.sol
+++ b/contracts/asset-proxy/contracts/src/interfaces/IUniswapExchangeFactory.sol
@@ -28,5 +28,5 @@ interface IUniswapExchangeFactory {
     function getExchange(address tokenAddress)
         external
         view
-        returns (IUniswapExchange);
+        returns (address);
 }
diff --git a/contracts/asset-proxy/contracts/test/TestUniswapBridge.sol b/contracts/asset-proxy/contracts/test/TestUniswapBridge.sol
index 9f67714a1b..db3a14a254 100644
--- a/contracts/asset-proxy/contracts/test/TestUniswapBridge.sol
+++ b/contracts/asset-proxy/contracts/test/TestUniswapBridge.sol
@@ -407,9 +407,9 @@ contract TestUniswapBridge is
     function getExchange(address tokenAddress)
         external
         view
-        returns (IUniswapExchange)
+        returns (address)
     {
-        return IUniswapExchange(_testExchanges[tokenAddress]);
+        return address(_testExchanges[tokenAddress]);
     }
 
     // @dev Use `wethToken`.