diff --git a/testing/SimHarness.cpp b/testing/SimHarness.cpp
index 26f94f68..b6acb7e1 100644
--- a/testing/SimHarness.cpp
+++ b/testing/SimHarness.cpp
@@ -31,7 +31,7 @@ void SimHarness::RunCycle() {
       millis();
     }
   }
-  Kaleidoscope.loop();
+  kaleidoscope::Runtime.loop();
 }
 
 void SimHarness::RunCycles(size_t n) {
@@ -39,20 +39,20 @@ void SimHarness::RunCycles(size_t n) {
 }
 
 void SimHarness::RunForMillis(size_t t) {
-  auto start_time = Kaleidoscope.millisAtCycleStart();
-  while (Kaleidoscope.millisAtCycleStart() - start_time < t) {
+  auto start_time = kaleidoscope::Runtime.millisAtCycleStart();
+  while (kaleidoscope::Runtime.millisAtCycleStart() - start_time < t) {
     RunCycle();
   }
 }
 
 void SimHarness::Press(KeyAddr key_addr) {
-  Kaleidoscope.device().keyScanner().setKeystate(
+  kaleidoscope::Runtime.device().keyScanner().setKeystate(
     key_addr,
     kaleidoscope::Device::Props::KeyScanner::KeyState::Pressed);
 }
 
 void SimHarness::Release(KeyAddr key_addr) {
-  Kaleidoscope.device().keyScanner().setKeystate(
+  kaleidoscope::Runtime.device().keyScanner().setKeystate(
     key_addr,
     kaleidoscope::Device::Props::KeyScanner::KeyState::NotPressed);
 }