diff --git a/include/ucore/ucore_backtrace.h b/include/ucore/ucore_backtrace.h
index 7de6b72..b4bb1e5 100644
--- a/include/ucore/ucore_backtrace.h
+++ b/include/ucore/ucore_backtrace.h
@@ -1,7 +1,7 @@
 #ifndef UC_BACKTRACE_H_
 #define UC_BACKTRACE_H_
 
-#define UC_BACTRACE_STDERR uc_backtrace_fd(3)
+#define UC_BACTRACE_STDERR uc_backtrace_fd(2)
 
 void uc_backtrace_fd(int fd);