diff --git a/Makefile b/Makefile
index faaef5b..8e6ba3f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 DESTDIR=
 PREFIX=/usr/local
 CXX=clang++
-LD=`xcrun -f clang++`
+LD=$(shell xcrun -f clang++)
 CXXFLAGS=-O2 -std=c++17
 LDFLAGS=-std=c++17
 
diff --git a/src/ParallelForEach.h b/src/ParallelForEach.h
index 43232ce..2f1c9b4 100644
--- a/src/ParallelForEach.h
+++ b/src/ParallelForEach.h
@@ -10,7 +10,7 @@ inline void parallel_for_each(It a, It b, F&& f)
     using data_t = std::pair<It, F>;
     data_t helper = data_t(a, std::forward<F>(f));
     dispatch_apply_f(count,
-                     dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),
+                     dispatch_get_global_queue(QOS_CLASS_USER_INTERACTIVE, 0),
                      &helper,
                      [](void* ctx, size_t cnt) {
         data_t* d = static_cast<data_t*>(ctx);