diff --git a/webrtc/modules/utility/source/process_thread_impl_unittest.cc b/webrtc/modules/utility/source/process_thread_impl_unittest.cc
index 1fe3a417f8..ec3b5a1909 100644
--- a/webrtc/modules/utility/source/process_thread_impl_unittest.cc
+++ b/webrtc/modules/utility/source/process_thread_impl_unittest.cc
@@ -27,6 +27,11 @@ using ::testing::Invoke;
 using ::testing::Return;
 using ::testing::SetArgPointee;
 
+// The length of time, in milliseconds, to wait for an event to become signaled.
+// Set to a fairly large value as there is quite a bit of variation on some
+// Windows bots.
+static const int kEventWaitTimeout = 500;
+
 class MockModule : public Module {
  public:
   MOCK_METHOD0(TimeUntilNextProcess, int64_t());
@@ -87,7 +92,7 @@ TEST(ProcessThreadImpl, ProcessCall) {
   EXPECT_CALL(module, ProcessThreadAttached(&thread)).Times(1);
 
   thread.RegisterModule(&module);
-  EXPECT_EQ(kEventSignaled, event->Wait(100));
+  EXPECT_EQ(kEventSignaled, event->Wait(kEventWaitTimeout));
 
   EXPECT_CALL(module, ProcessThreadAttached(nullptr)).Times(1);
   thread.Stop();
@@ -109,7 +114,7 @@ TEST(ProcessThreadImpl, ProcessCall2) {
 
   EXPECT_CALL(module, ProcessThreadAttached(&thread)).Times(1);
   thread.Start();
-  EXPECT_EQ(kEventSignaled, event->Wait(100));
+  EXPECT_EQ(kEventSignaled, event->Wait(kEventWaitTimeout));
 
   EXPECT_CALL(module, ProcessThreadAttached(nullptr)).Times(1);
   thread.Stop();
@@ -135,7 +140,7 @@ TEST(ProcessThreadImpl, Deregister) {
   EXPECT_CALL(module, ProcessThreadAttached(&thread)).Times(1);
   thread.Start();
 
-  EXPECT_EQ(kEventSignaled, event->Wait(100));
+  EXPECT_EQ(kEventSignaled, event->Wait(kEventWaitTimeout));
 
   EXPECT_CALL(module, ProcessThreadAttached(nullptr)).Times(1);
   thread.DeRegisterModule(&module);
@@ -281,9 +286,9 @@ TEST(ProcessThreadImpl, WakeUp) {
   EXPECT_CALL(module, ProcessThreadAttached(&thread)).Times(1);
   thread.RegisterModule(&module);
 
-  EXPECT_EQ(kEventSignaled, started->Wait(100));
+  EXPECT_EQ(kEventSignaled, started->Wait(kEventWaitTimeout));
   thread.WakeUp(&module);
-  EXPECT_EQ(kEventSignaled, called->Wait(100));
+  EXPECT_EQ(kEventSignaled, called->Wait(kEventWaitTimeout));
 
   EXPECT_CALL(module, ProcessThreadAttached(nullptr)).Times(1);
   thread.Stop();
@@ -302,7 +307,7 @@ TEST(ProcessThreadImpl, PostTask) {
   std::unique_ptr<RaiseEventTask> task(new RaiseEventTask(task_ran.get()));
   thread.Start();
   thread.PostTask(std::move(task));
-  EXPECT_EQ(kEventSignaled, task_ran->Wait(100));
+  EXPECT_EQ(kEventSignaled, task_ran->Wait(kEventWaitTimeout));
   thread.Stop();
 }