diff --git a/sys/pm_layered/pm.c b/sys/pm_layered/pm.c
index b7c61b0759..efff800cdf 100644
--- a/sys/pm_layered/pm.c
+++ b/sys/pm_layered/pm.c
@@ -74,7 +74,6 @@ void pm_set_lowest(void)
     irq_restore(state);
 }
 
-__attribute__((optimize(3)))
 void pm_block(unsigned mode)
 {
     DEBUG("[pm_layered] pm_block(%d)\n", mode);
@@ -85,7 +84,6 @@ void pm_block(unsigned mode)
     irq_restore(state);
 }
 
-__attribute__((optimize(3)))
 void pm_unblock(unsigned mode)
 {
     DEBUG("[pm_layered] pm_unblock(%d)\n", mode);