diff --git a/TESTS/mbed_hal/sleep_manager/main.cpp b/TESTS/mbed_hal/sleep_manager/main.cpp
index 8849602356..8f9654b399 100644
--- a/TESTS/mbed_hal/sleep_manager/main.cpp
+++ b/TESTS/mbed_hal/sleep_manager/main.cpp
@@ -40,8 +40,6 @@ using utest::v1::Harness;
  */
 void wraparound_lp_protect(void)
 {
-    uint32_t time_window;
-
     const uint32_t ticks_now = get_lp_ticker_data()->interface->read();
     const ticker_info_t *p_ticker_info = get_lp_ticker_data()->interface->get_info();