diff --git a/webrtc/p2p/base/relayport_unittest.cc b/webrtc/p2p/base/relayport_unittest.cc
index 738ea9abb2..8574af3a74 100644
--- a/webrtc/p2p/base/relayport_unittest.cc
+++ b/webrtc/p2p/base/relayport_unittest.cc
@@ -152,8 +152,11 @@ class RelayPortTest : public testing::Test,
 
     EXPECT_FALSE(relay_port_->IsReady());
 
-    // Should have timed out in 200 + 200 + 400 + 800 + 1600 ms.
-    EXPECT_TRUE_WAIT(HasFailed(&fake_protocol_address), 3600);
+    // Should have timed out in 200 + 200 + 400 + 800 + 1600 ms = 3200ms.
+    // Add some margin of error for slow bots.
+    // TODO(deadbeef): Use simulated clock instead of just increasing timeouts
+    // to fix flaky tests.
+    EXPECT_TRUE_WAIT(HasFailed(&fake_protocol_address), 5000);
 
     // Wait until relayport is ready.
     EXPECT_TRUE_WAIT(relay_port_->IsReady(), kMaxTimeoutMs);
diff --git a/webrtc/p2p/base/stunrequest_unittest.cc b/webrtc/p2p/base/stunrequest_unittest.cc
index 5845a0ecbb..5fb34a85d2 100644
--- a/webrtc/p2p/base/stunrequest_unittest.cc
+++ b/webrtc/p2p/base/stunrequest_unittest.cc
@@ -17,6 +17,12 @@
 
 using namespace cricket;
 
+// STUN timeout (with all retries) is 9500ms.
+// Add some margin of error for slow bots.
+// TODO(deadbeef): Use simulated clock instead of just increasing timeouts to
+// fix flaky tests.
+static const int kTimeoutMs = 15000;
+
 class StunRequestTest : public testing::Test,
                         public sigslot::has_slots<> {
  public:
@@ -172,7 +178,7 @@ TEST_F(StunRequestTest, TestTimeout) {
   StunMessage* res = CreateStunMessage(STUN_BINDING_RESPONSE, req);
 
   manager_.Send(new StunRequestThunker(req, this));
-  rtc::Thread::Current()->ProcessMessages(10000);  // > STUN timeout
+  rtc::Thread::Current()->ProcessMessages(kTimeoutMs);
   EXPECT_FALSE(manager_.CheckResponse(res));
 
   EXPECT_TRUE(response_ == NULL);