diff --git a/flake.nix b/flake.nix
index 40bfe255..210b80be 100644
--- a/flake.nix
+++ b/flake.nix
@@ -99,6 +99,9 @@
           };
 
           cabal2nixOptions = "--benchmark -fdev";
+
+          # https://github.com/tweag/monad-bayes/pull/256: Don't run tests on Mac because of machine precision issues
+          modifier = drv: if system == "x86_64-linux" then drv else pkgs.haskell.lib.dontCheck drv;
         };
 
         jupyterEnvironment = mkJupyterlabFromPath ./kernels {inherit pkgs monad-bayes;};