diff --git a/test/invariants/fuzz/BMath.t.sol b/test/invariants/fuzz/BMath.t.sol
index 3c4af8b8..620a246e 100644
--- a/test/invariants/fuzz/BMath.t.sol
+++ b/test/invariants/fuzz/BMath.t.sol
@@ -142,7 +142,7 @@ contract FuzzBMath is EchidnaTest {
   //   assert(tokenAmountIn <= calc_tokenAmountIn);
   // }
 
-  uint256 FEE_DISCOUNT = 0.5e18;
+  uint256 FEE_DISCOUNT = 0; // compare against no fee
 
   // calcPoolOutGivenSingleIn * calcSingleOutGivenPoolIn should be equal to calcOutGivenIn
   function fuzz_testIndirectSwaps_CalcOutGivenIn(