diff --git a/pkgs/development/compilers/llvm/11/libcxxabi/default.nix b/pkgs/development/compilers/llvm/11/libcxxabi/default.nix
index 9f6e303d31f7..6201992512ec 100644
--- a/pkgs/development/compilers/llvm/11/libcxxabi/default.nix
+++ b/pkgs/development/compilers/llvm/11/libcxxabi/default.nix
@@ -33,7 +33,7 @@ stdenv.mkDerivation {
   nativeBuildInputs = [ cmake ];
   buildInputs = lib.optional withLibunwind libunwind;
 
-  cmakeFlags = lib.optionals (stdenv.hostPlatform.useLLVM or false) [
+  cmakeFlags = lib.optionals standalone [
     "-DLLVM_ENABLE_LIBCXX=ON"
     "-DLIBCXXABI_USE_LLVM_UNWINDER=ON"
   ] ++ lib.optionals stdenv.hostPlatform.isWasm [