diff --git a/os/backtrace.c b/os/backtrace.c
index a8866882b..a421140fb 100644
--- a/os/backtrace.c
+++ b/os/backtrace.c
@@ -29,7 +29,9 @@
 #include "misc.h"
 
 #ifdef HAVE_BACKTRACE
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 #include <dlfcn.h>
 #include <execinfo.h>