diff --git a/stm8s.h b/stm8s.h
index 2273c2f..ebbcf1c 100644
--- a/stm8s.h
+++ b/stm8s.h
@@ -3456,9 +3456,11 @@ typedef struct {
 
 /* some useful assembly instructions */
 // wait for event (go to sleep)
-#define wfe() { __asm__("wfi\n"); }
+#define wfe() { __asm__("wfe\n"); }
 // wait for interrupt (go to sleep)
 #define wfi() { __asm__("wfi\n"); }
+// go into halt mode
+#define halt() { __asm__("halt\n"); }
 // disable interrupts
 #define sim() { __asm__("sim"); }
 // enable interrupts