diff --git a/test/initmain.c b/test/initmain.c
index 8cb1f00c..95a38201 100644
--- a/test/initmain.c
+++ b/test/initmain.c
@@ -44,6 +44,7 @@ Test(InitAfterInitialized)
 
 struct testParams {
 	uint32_t flag;
+	threadSysError err;
 };
 
 /*
@@ -148,8 +149,7 @@ static void queueThread(void *data)
 {
 	struct testParams *p = (struct testParams *) data;
 
-	// TODO reintegrate the timer somehow
-//	p->err = timerSleep(1250 * timerMillisecond);
+	p->err = threadSleep(1250 * threadMillisecond);
 	uiQueueMain(queued, p);
 }
 
@@ -168,8 +168,8 @@ Test(QueueMain_DifferentThread)
 	err = threadThreadWaitAndFree(thread);
 	if (err != 0)
 		TestFatalf("error waiting for thread to finish: " threadSysErrorFmt, threadSysErrorFmtArg(err));
-//	if (p.err != 0)
-//		TestErrorf("error sleeping in thread to ensure a high likelihood the uiQueueMain() is run after uiMain() starts: " timerSysErrorFmt, timerSysErrorFmtArg(p.err));
+	if (p.err != 0)
+		TestErrorf("error sleeping in thread to ensure a high likelihood the uiQueueMain() is run after uiMain() starts: " threadSysErrorFmt, threadSysErrorFmtArg(p.err));
 	if (p.flag != 1)
 		TestErrorf("uiQueueMain() didn't set flag properly:" diff("%d"),
 			p.flag, 1);
@@ -179,7 +179,7 @@ static void queueOrderThread(void *data)
 {
 	struct testParams *p = (struct testParams *) data;
 
-//	p->err = timerSleep(1250 * timerMillisecond);
+	p->err = threadSleep(1250 * threadMillisecond);
 	queueOrder(p);
 }
 
@@ -198,8 +198,8 @@ Test(QueueMain_DifferentThreadSequence)
 	err = threadThreadWaitAndFree(thread);
 	if (err != 0)
 		TestFatalf("error waiting for thread to finish: " threadSysErrorFmt, threadSysErrorFmtArg(err));
-//	if (p.err != 0)
-//		TestErrorf("error sleeping in thread to ensure a high likelihood the uiQueueMain() is run after uiMain() starts: " timerSysErrorFmt, timerSysErrorFmtArg(p.err));
+	if (p.err != 0)
+		TestErrorf("error sleeping in thread to ensure a high likelihood the uiQueueMain() is run after uiMain() starts: " threadSysErrorFmt, threadSysErrorFmtArg(p.err));
 	checkOrder(p.flag);
 }
 
diff --git a/test/thread.h b/test/thread.h
index bb809edf..519251b0 100644
--- a/test/thread.h
+++ b/test/thread.h
@@ -23,6 +23,18 @@ typedef uint64_t threadSysError;
 extern threadSysError threadNewThread(void (*f)(void *data), void *data, threadThread **t);
 extern threadSysError threadThreadWaitAndFree(threadThread *t);
 
+typedef int64_t threadDuration;
+
+#define threadDurationMin ((threadDuration) INT64_MIN)
+#define threadDurationMax ((threadDuration) INT64_MAX)
+
+#define threadNanosecond ((threadDuration) 1)
+#define threadMicrosecond ((threadDuration) 1000)
+#define threadMillisecond ((threadDuration) 1000000)
+#define threadSecond ((threadDuration) 1000000000)
+
+extern threadSysError threadSleep(threadDuration d);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/test/thread_notwindows.c b/test/thread_notwindows.c
index 0991f9cb..8aa0277f 100644
--- a/test/thread_notwindows.c
+++ b/test/thread_notwindows.c
@@ -4,8 +4,10 @@
 #define _POSIX_C_SOURCE 200112L
 #define _XOPEN_SOURCE 600
 #include <errno.h>
-#include <stdlib.h>
 #include <pthread.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <time.h>
 #include "thread.h"
 
 // Do not put any test cases in this file; they will not be run.
@@ -63,3 +65,21 @@ threadSysError threadThreadWaitAndFree(threadThread *t)
 	free(t);
 	return 0;
 }
+
+threadSysError threadSleep(threadDuration d)
+{
+	struct timespec duration, remaining;
+	int err;
+
+	duration.tv_sec = d / threadSecond;
+	duration.tv_nsec = d % threadSecond;
+	for (;;) {
+		errno = 0;
+		if (nanosleep(&duration, &remaining) == 0)
+			return 0;
+		err = errno;
+		if (err != EINTR)
+			return (threadSysError) err;
+		duration = remaining;
+	}
+}
diff --git a/test/thread_windows.c b/test/thread_windows.c
index 2293c75a..d7babf86 100644
--- a/test/thread_windows.c
+++ b/test/thread_windows.c
@@ -52,6 +52,26 @@ static HRESULT WINAPI hrWaitForSingleObject(HANDLE handle, DWORD timeout)
 	return S_OK;
 }
 
+static HRESULT WINAPI hrCreateWaitableTimerW(LPSECURITY_ATTRIBUTES attributes, BOOL manualReset, LPCWSTR name, HANDLE *handle)
+{
+	SetLastError(0);
+	*handle = CreateWaitableTimerW(attributes, manualReset, name);
+	if (*handle == NULL)
+		return lastErrorToHRESULT();
+	return S_OK;
+}
+
+static HRESULT WINAPI hrSetWaitableTimer(HANDLE timer, const LARGE_INTEGER *duration, LONG period, PTIMERAPCROUTINE completionRoutine, LPVOID completionData, BOOL resume)
+{
+	BOOL ret;
+
+	SetLastError(0);
+	ret = SetWaitableTimer(timer, duration, period, completionRoutine, completionData, resume);
+	if (ret == 0)
+		return lastErrorToHRESULT();
+	return S_OK;
+}
+
 struct threadThread {
 	uintptr_t handle;
 	void (*f)(void *data);
@@ -100,3 +120,24 @@ threadSysError threadThreadWaitAndFree(threadThread *t)
 	free(t);
 	return 0;
 }
+
+threadSysError timerSleep(threadDuration d)
+{
+	HANDLE timer;
+	LARGE_INTEGER duration;
+	HRESULT hr;
+
+	duration.QuadPart = d / 100;
+	duration.QuadPart = -duration.QuadPart;
+	hr = hrCreateWaitableTimerW(NULL, TRUE, NULL, &timer);
+	if (hr != S_OK)
+		return (threadSysError) hr;
+	hr = hrSetWaitableTimer(timer, &duration, 0, NULL, NULL, FALSE);
+	if (hr != S_OK) {
+		CloseHandle(timer);
+		return (threadSysError) hr;
+	}
+	hr = hrWaitForSingleObject(timer, INFINITE);
+	CloseHandle(timer);
+	return (threadSysError) hr;
+}