diff --git a/test/regress_main.c b/test/regress_main.c
index 9a95d365..26656121 100644
--- a/test/regress_main.c
+++ b/test/regress_main.c
@@ -33,6 +33,14 @@
 #include <fcntl.h>
 #endif
 
+/* move_pthread_to_realtime_scheduling_class() */
+#ifdef EVENT__HAVE_MACH_MACH_H
+#include <mach/mach.h>
+#endif
+#ifdef EVENT__HAVE_MACH_MACH_TIME_H
+#include <mach/mach_time.h>
+#endif
+
 #if defined(__APPLE__) && defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)
 #if (__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1060 && \
     __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1070)
@@ -188,6 +196,45 @@ ignore_log_cb(int s, const char *msg)
 {
 }
 
+/**
+ * Put into the real time scheduling class for better timers latency.
+ * https://developer.apple.com/library/archive/technotes/tn2169/_index.html#//apple_ref/doc/uid/DTS40013172-CH1-TNTAG6000
+ */
+#if defined(__APPLE__)
+static void move_pthread_to_realtime_scheduling_class(pthread_t pthread)
+{
+	mach_timebase_info_data_t info;
+	mach_timebase_info(&info);
+
+	const uint64_t NANOS_PER_MSEC = 1000000ULL;
+	double clock2abs =
+		((double)info.denom / (double)info.numer) * NANOS_PER_MSEC;
+
+	thread_time_constraint_policy_data_t policy;
+	policy.period      = 0;
+	policy.computation = (uint32_t)(5 * clock2abs); // 5 ms of work
+	policy.constraint  = (uint32_t)(10 * clock2abs);
+	policy.preemptible = FALSE;
+
+	int kr = thread_policy_set(pthread_mach_thread_np(pthread),
+		THREAD_TIME_CONSTRAINT_POLICY,
+		(thread_policy_t)&policy,
+		THREAD_TIME_CONSTRAINT_POLICY_COUNT);
+	if (kr != KERN_SUCCESS) {
+		mach_error("thread_policy_set:", kr);
+		exit(1);
+	}
+}
+
+void thread_setup(THREAD_T pthread)
+{
+	move_pthread_to_realtime_scheduling_class(pthread);
+}
+#else /** \__APPLE__ */
+void thread_setup(THREAD_T pthread) {}
+#endif /** \!__APPLE__ */
+
+
 void *
 basic_test_setup(const struct testcase_t *testcase)
 {
@@ -195,9 +242,7 @@ basic_test_setup(const struct testcase_t *testcase)
 	evutil_socket_t spair[2] = { -1, -1 };
 	struct basic_test_data *data = NULL;
 
-#ifndef EVENT__DISABLE_THREAD_SUPPORT
 	thread_setup(THREAD_SELF());
-#endif
 
 #ifndef _WIN32
 	if (testcase->flags & TT_ENABLE_IOCP_FLAG)
diff --git a/test/regress_thread.c b/test/regress_thread.c
index 69f59ed1..1e0ce41f 100644
--- a/test/regress_thread.c
+++ b/test/regress_thread.c
@@ -66,51 +66,6 @@
 #include "time-internal.h"
 #include "regress_thread.h"
 
-/**
- * Put into the real time scheduling class for better timers latency.
- * https://developer.apple.com/library/archive/technotes/tn2169/_index.html#//apple_ref/doc/uid/DTS40013172-CH1-TNTAG6000
- */
-#if defined(__APPLE__)
-#ifdef EVENT__HAVE_MACH_MACH_H
-#include <mach/mach.h>
-#endif
-#ifdef EVENT__HAVE_MACH_MACH_TIME_H
-#include <mach/mach_time.h>
-#endif
-static void move_pthread_to_realtime_scheduling_class(pthread_t pthread)
-{
-	mach_timebase_info_data_t info;
-	mach_timebase_info(&info);
-
-	const uint64_t NANOS_PER_MSEC = 1000000ULL;
-	double clock2abs =
-		((double)info.denom / (double)info.numer) * NANOS_PER_MSEC;
-
-	thread_time_constraint_policy_data_t policy;
-	policy.period      = 0;
-	policy.computation = (uint32_t)(5 * clock2abs); // 5 ms of work
-	policy.constraint  = (uint32_t)(10 * clock2abs);
-	policy.preemptible = FALSE;
-
-	int kr = thread_policy_set(pthread_mach_thread_np(pthread),
-		THREAD_TIME_CONSTRAINT_POLICY,
-		(thread_policy_t)&policy,
-		THREAD_TIME_CONSTRAINT_POLICY_COUNT);
-	if (kr != KERN_SUCCESS) {
-		mach_error("thread_policy_set:", kr);
-		exit(1);
-	}
-}
-
-void thread_setup(THREAD_T pthread)
-{
-	move_pthread_to_realtime_scheduling_class(pthread);
-}
-#else /** \__APPLE__ */
-void thread_setup(THREAD_T pthread) {}
-#endif /** \!__APPLE__ */
-
-
 struct cond_wait {
 	void *lock;
 	void *cond;
diff --git a/test/regress_thread.h b/test/regress_thread.h
index ef8943e3..a954fefa 100644
--- a/test/regress_thread.h
+++ b/test/regress_thread.h
@@ -27,9 +27,18 @@
 #ifndef REGRESS_THREAD_H_INCLUDED_
 #define REGRESS_THREAD_H_INCLUDED_
 
-#include "regress.h"
-
-#ifdef EVENT__HAVE_PTHREADS /** PTHREADS */
+#if defined(_WIN32) /** _WIN32 */
+#define THREAD_T void * /* HANDLE */
+#define THREAD_FN unsigned __stdcall
+#define THREAD_RETURN() return (0)
+#define THREAD_SELF() GetCurrentThreadId()
+#define THREAD_START(threadvar, fn, arg) do {                         \
+	uintptr_t threadhandle = _beginthreadex(NULL,0,fn,(arg),0,NULL);  \
+	(threadvar) = (THREAD_T)threadhandle;                             \
+	thread_setup(threadvar);                                          \
+} while (0)
+#define THREAD_JOIN(th) WaitForSingleObject(th, INFINITE)
+#else /* !_WIN32 */
 #include <pthread.h>
 #define THREAD_T pthread_t
 #define THREAD_FN void *
@@ -40,21 +49,8 @@
 		thread_setup(threadvar);                       \
 } while (0)
 #define THREAD_JOIN(th) pthread_join(th, NULL)
-#elif defined(_WIN32) /** _WIN32 */
-#define THREAD_T HANDLE
-#define THREAD_FN unsigned __stdcall
-#define THREAD_RETURN() return (0)
-#define THREAD_SELF() GetCurrentThreadId()
-#define THREAD_START(threadvar, fn, arg) do {                         \
-	uintptr_t threadhandle = _beginthreadex(NULL,0,fn,(arg),0,NULL);  \
-	(threadvar) = (HANDLE) threadhandle;                              \
-	thread_setup(threadvar);                                          \
-} while (0)
-#define THREAD_JOIN(th) WaitForSingleObject(th, INFINITE)
 #endif /* \!_WIN32 */
 
-#ifndef EVENT__DISABLE_THREAD_SUPPORT
 void thread_setup(THREAD_T pthread);
-#endif
 
 #endif