diff --git a/include/ets_sys.h b/include/ets_sys.h
index aed52f33..77887f9f 100755
--- a/include/ets_sys.h
+++ b/include/ets_sys.h
@@ -65,6 +65,8 @@ typedef void (* ets_isr_t)(void *);
 void ets_intr_lock(void);
 void ets_intr_unlock(void);
 void ets_isr_attach(int i, ets_isr_t func, void *arg);
+void ets_isr_mask(int);
+void ets_isr_unmask(int);
 
 void NmiTimSetFunc(void (*func)(void));