diff --git a/source/Core/Threads/OperatingModes/utils/shouldDeviceSleep.cpp b/source/Core/Threads/OperatingModes/utils/shouldDeviceSleep.cpp
index 248a2004..b28b451e 100644
--- a/source/Core/Threads/OperatingModes/utils/shouldDeviceSleep.cpp
+++ b/source/Core/Threads/OperatingModes/utils/shouldDeviceSleep.cpp
@@ -1,5 +1,9 @@
+#include "Buttons.hpp"
 #include "OperatingModeUtilities.h"
 
+TickType_t        lastHallEffectSleepStart = 0;
+extern TickType_t lastMovementTime;
+
 bool shouldBeSleeping(bool inAutoStart) {
 #ifndef NO_SLEEP_MODE
   // Return true if the iron should be in sleep mode