diff --git a/pkgs/development/libraries/tbb/default.nix b/pkgs/development/libraries/tbb/default.nix
index ff6a3343837b..b6cc969b9f78 100644
--- a/pkgs/development/libraries/tbb/default.nix
+++ b/pkgs/development/libraries/tbb/default.nix
@@ -39,6 +39,8 @@ stdenv.mkDerivation rec {
   # Fix build with modern gcc
   # In member function 'void std::__atomic_base<_IntTp>::store(__int_type, std::memory_order) [with _ITp = bool]',
   NIX_CFLAGS_COMPILE = lib.optionals stdenv.cc.isGNU [ "-Wno-error=stringop-overflow" ] ++
+    # error: variable 'val' set but not used
+    lib.optionals stdenv.cc.isClang [ "-Wno-error=unused-but-set-variable" ] ++
     # Workaround for gcc-12 ICE when using -O3
     # https://gcc.gnu.org/PR108854
     lib.optionals (stdenv.cc.isGNU && stdenv.isx86_32) [ "-O2" ];