diff --git a/pkgs/development/tools/boost-build/default.nix b/pkgs/development/tools/boost-build/default.nix
index fe8f1a4682fe..7a42df152829 100644
--- a/pkgs/development/tools/boost-build/default.nix
+++ b/pkgs/development/tools/boost-build/default.nix
@@ -36,11 +36,7 @@ stdenv.mkDerivation {
   patches = useBoost.boostBuildPatches or []
     ++ lib.optional (useBoost ? version && lib.versionAtLeast useBoost.version "1.81") ./fix-clang-target.patch;
 
-  # Upstream defaults to gcc on darwin, but we use clang.
-  postPatch = ''
-    substituteInPlace src/build-system.jam \
-    --replace "default-toolset = darwin" "default-toolset = clang-darwin"
-  '' + lib.optionalString (useBoost ? version && lib.versionAtLeast useBoost.version "1.82") ''
+  postPatch = lib.optionalString (useBoost ? version && lib.versionAtLeast useBoost.version "1.82") ''
     patchShebangs --build src/engine/build.sh
   '';