diff --git a/include/uv/win.h b/include/uv/win.h
index 7b4ebd4b7..5e20606c9 100644
--- a/include/uv/win.h
+++ b/include/uv/win.h
@@ -279,7 +279,7 @@ typedef struct {
   DWORD tls_index;
 } uv_key_t;
 
-#define UV_ONCE_INIT { 0, { NULL } }
+#define UV_ONCE_INIT { 0, INIT_ONCE_STATIC_INIT }
 
 typedef struct uv_once_s {
   unsigned char unused;