diff --git a/mission/controller/ThermalController.cpp b/mission/controller/ThermalController.cpp
index b6cbec74..eb473a5f 100644
--- a/mission/controller/ThermalController.cpp
+++ b/mission/controller/ThermalController.cpp
@@ -699,9 +699,8 @@ void ThermalController::copyDevices() {
   if (result != RETURN_OK) {
     sif::warning << "ThermalController: Failed to read ACU temperatures" << std::endl;
     deviceTemperatures.acu.setValid(false);
-    deviceTemperatures.acu[0] = static_cast<float>(INVALID_TEMPERATURE);
-    deviceTemperatures.acu[1] = static_cast<float>(INVALID_TEMPERATURE);
-    deviceTemperatures.acu[2] = static_cast<float>(INVALID_TEMPERATURE);
+    std::memset(deviceTemperatures.acu.value, INVALID_TEMPERATURE,
+                deviceTemperatures.acu.getSize());
   }
   else {
     deviceTemperatures.acu.setValid(tempAcu.isValid());
diff --git a/tmtc b/tmtc
index e2de2e02..46be9fa0 160000
--- a/tmtc
+++ b/tmtc
@@ -1 +1 @@
-Subproject commit e2de2e0212d5af87b111e6176f3b9f20b56081df
+Subproject commit 46be9fa0923f2a6a54f49f4cf6fe045361321646