diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog
index 789f78af6b803342d1a00371f881027161b9bb03..cb94bfb7042e3154addb234d5922123f1894862a 100644
--- a/libgcc/ChangeLog
+++ b/libgcc/ChangeLog
@@ -1,3 +1,8 @@
+2019-12-30  Olivier Hainque  <hainque@adacore.com>
+
+	* config/gthr-vxworks.h (GTHREAD_ONCE_INIT): Use
+	standard zero-initializer syntax.
+
 2019-12-30  Olivier Hainque  <hainque@adacore.com>
 
 	* config/gthr-vxworks-tls.c (__gthread_getspecific): Fix
diff --git a/libgcc/config/gthr-vxworks.h b/libgcc/config/gthr-vxworks.h
index 7e3779a010a69cd177ecf66494b7c314c80fa33d..70205cec18a7c0a12741ece83ae6de0aea8cb7c5 100644
--- a/libgcc/config/gthr-vxworks.h
+++ b/libgcc/config/gthr-vxworks.h
@@ -215,7 +215,7 @@ typedef struct
 #endif
 } __gthread_once_t;
 
-#define __GTHREAD_ONCE_INIT { 0 }
+#define __GTHREAD_ONCE_INIT {}
 
 extern int __gthread_once (__gthread_once_t *__once, void (*__func)(void));