diff --git a/features/FEATURE_BLE/targets/TARGET_NORDIC/TARGET_MCU_NRF51822/hal_patch/sleep.c b/features/FEATURE_BLE/targets/TARGET_NORDIC/TARGET_MCU_NRF51822/hal_patch/sleep.c
index 7c178188a5..aec280a0fb 100644
--- a/features/FEATURE_BLE/targets/TARGET_NORDIC/TARGET_MCU_NRF51822/hal_patch/sleep.c
+++ b/features/FEATURE_BLE/targets/TARGET_NORDIC/TARGET_MCU_NRF51822/hal_patch/sleep.c
@@ -66,6 +66,6 @@ void hal_sleep(void)
 
 void hal_deepsleep(void)
 {
-    sleep();
+    hal_sleep();
     //   NRF_POWER->SYSTEMOFF=1;
 }