diff --git a/openmp/runtime/test/tasking/hidden_helper_task/affinity.cpp b/openmp/runtime/test/tasking/hidden_helper_task/affinity.cpp
--- a/openmp/runtime/test/tasking/hidden_helper_task/affinity.cpp
+++ b/openmp/runtime/test/tasking/hidden_helper_task/affinity.cpp
@@ -1,3 +1,4 @@
+// REQUIRES: linux
 // RUN: %libomp-cxx-compile
 // RUN: env LIBOMP_USE_HIDDEN_HELPER_TASK=1 LIBOMP_NUM_HIDDEN_HELPER_THREADS=8 \
 // RUN:     KMP_HIDDEN_HELPER_AFFINITY=verbose,granularity=socket,compact %libomp-run 2>&1 | FileCheck --check-prefix=SOCKET %s
diff --git a/openmp/runtime/test/tasking/hidden_helper_task/gtid.cpp b/openmp/runtime/test/tasking/hidden_helper_task/gtid.cpp
--- a/openmp/runtime/test/tasking/hidden_helper_task/gtid.cpp
+++ b/openmp/runtime/test/tasking/hidden_helper_task/gtid.cpp
@@ -1,5 +1,6 @@
 // RUN: %libomp-cxx-compile-and-run
 // RUN: %libomp-cxx-compile && env OMP_NUM_THREADS=1 %libomp-run
+// REQUIRES: linux
 
 /*
  * This test aims to check whether hidden helper thread has right gtid. We also
diff --git a/openmp/runtime/test/worksharing/for/kmp_sch_simd_guided.c b/openmp/runtime/test/worksharing/for/kmp_sch_simd_guided.c
--- a/openmp/runtime/test/worksharing/for/kmp_sch_simd_guided.c
+++ b/openmp/runtime/test/worksharing/for/kmp_sch_simd_guided.c
@@ -50,7 +50,11 @@
 static id loc = {0, 2, 0, 0, ";file;func;0;0;;"};
 // This variable is defined in OpenMP RTL but we can't have it exposed so we
 // need to redefine it here.
+#ifdef __linux__
 static int __kmp_hidden_helper_threads_num = 8;
+#else
+static int __kmp_hidden_helper_threads_num = 0;
+#endif
 
 // ---------------------------------------------------------------------------
 int run_loop_64(i64 loop_lb, i64 loop_ub, i64 loop_st, int loop_chunk) {