diff --git a/sos/thread.c b/sos/thread.c
index 00450ee..08b56bb 100644
--- a/sos/thread.c
+++ b/sos/thread.c
@@ -648,7 +648,7 @@ void sos_thread_dump_backtrace(sos_bool_t on_console,
   sos_vaddr_t stack_bottom = current_thread->kernel_stack_base_addr;
   sos_size_t stack_size    = current_thread->kernel_stack_size;
 
-  static void backtracer(sos_vaddr_t PC,
+  void backtracer(sos_vaddr_t PC,
 			 sos_vaddr_t params,
 			 sos_ui32_t depth,
 			 void *custom_arg)