diff --git a/sys/pm_layered/pm.c b/sys/pm_layered/pm.c
index 8a0326a3bf..ede2b51dd7 100644
--- a/sys/pm_layered/pm.c
+++ b/sys/pm_layered/pm.c
@@ -88,10 +88,10 @@ void pm_unblock(unsigned mode)
 }
 
 #ifndef PROVIDES_PM_LAYERED_OFF
-void  pm_off(void)
+void pm_off(void)
 {
     pm_blocker.val_u32 = 0;
     pm_set_lowest();
-    while(1);
+    while(1) {}
 }
 #endif