diff --git a/global.c b/global.c
index 5adad39..7f0311e 100644
--- a/global.c
+++ b/global.c
@@ -167,7 +167,7 @@ void sleep_ms(uint32_t duration)
 	sleep_duration = duration; // save sleep duration for count down
 	systick_counter_enable(); // start counting
 	while (sleep_duration>0) { // wait for count down to complete
-//		__WFI(); // go to sleep	
+		__WFI(); // go to sleep	
 	}
 }