diff --git a/contracts/exchange-libs/contracts/src/interfaces/IMixinLibMathRichErrors.sol b/contracts/exchange-libs/contracts/src/interfaces/IMixinLibMathRichErrors.sol
index d42923cd53..f259cbb9ac 100644
--- a/contracts/exchange-libs/contracts/src/interfaces/IMixinLibMathRichErrors.sol
+++ b/contracts/exchange-libs/contracts/src/interfaces/IMixinLibMathRichErrors.sol
@@ -8,6 +8,6 @@ contract IMixinLibMathRichErrors {
         0xa791837c;
 
     // bytes4(keccak256("RoundingError(uint256,uint256,uint256)"))
-    bytes4 internal constant ROUNDING_ERROR =
+    bytes4 internal constant ROUNDING_ERROR_SELECTOR =
         0x339f3de2;
 }