diff --git a/source/Core/Threads/OperatingModes/utils/printSleepCountdown.cpp b/source/Core/Threads/OperatingModes/utils/printSleepCountdown.cpp
index f883bd0d..c0a3d0d5 100644
--- a/source/Core/Threads/OperatingModes/utils/printSleepCountdown.cpp
+++ b/source/Core/Threads/OperatingModes/utils/printSleepCountdown.cpp
@@ -1,4 +1,6 @@
+#include "Buttons.hpp"
 #include "OperatingModeUtilities.h"
+extern TickType_t lastMovementTime;
 #ifndef NO_SLEEP_MODE
 void printCountdownUntilSleep(int sleepThres) {
   /*