diff --git a/quiche/quic/test_tools/quic_test_utils.h b/quiche/quic/test_tools/quic_test_utils.h
index 57eb068..7981335 100644
--- a/quiche/quic/test_tools/quic_test_utils.h
+++ b/quiche/quic/test_tools/quic_test_utils.h
@@ -527,7 +527,7 @@
 
  private:
   MockClock clock_;
-  MockRandom random_generator_;
+  testing::NiceMock<MockRandom> random_generator_;
   quiche::SimpleBufferAllocator buffer_allocator_;
 };