1 files changed, 3 insertions, 0 deletions
diff --git a/src/kernel/ao.h b/src/kernel/ao.h
index c11aa028..a225bc4a 100644
--- a/src/kernel/ao.h
+++ b/src/kernel/ao.h
@@ -132,6 +132,9 @@ ao_clock_init(void);
  */
 
 #ifndef ao_mutex_get
+uint8_t
+ao_mutex_try(__xdata uint8_t *ao_mutex, uint8_t task_id) __reentrant;
+
 void
 ao_mutex_get(__xdata uint8_t *ao_mutex) __reentrant;