diff --git a/mock_system_state.cc b/mock_system_state.cc
index b7ed27b..152347a 100644
--- a/mock_system_state.cc
+++ b/mock_system_state.cc
@@ -12,6 +12,7 @@
 MockSystemState::MockSystemState()
   : default_request_params_(this),
     prefs_(&mock_prefs_) {
+  clock_ = &default_clock_;
   request_params_ = &default_request_params_;
   mock_payload_state_.Initialize(this);
   mock_gpio_handler_ = new testing::NiceMock<MockGpioHandler>();