diff --git a/drivers/Timer.cpp b/drivers/Timer.cpp
index 5da9863d95..f523974e6b 100644
--- a/drivers/Timer.cpp
+++ b/drivers/Timer.cpp
@@ -35,7 +35,9 @@ Timer::Timer(const ticker_data_t *data) : _running(), _start(), _time(), _ticker
 Timer::~Timer() {
     core_util_critical_section_enter();
     if (_running) {
-        sleep_manager_unlock_deep_sleep();
+        if(_lock_deepsleep) {
+            sleep_manager_unlock_deep_sleep();
+        }
     }
     _running = 0;
     core_util_critical_section_exit();