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-rw-r--r--winsup/mingw/include/locale.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/winsup/mingw/include/locale.h b/winsup/mingw/include/locale.h
index 06db31a3d..16fb6119a 100644
--- a/winsup/mingw/include/locale.h
+++ b/winsup/mingw/include/locale.h
@@ -51,6 +51,10 @@
#ifndef RC_INVOKED
+/* According to C89 std, NULL is defined in locale.h too. */
+#define __need_NULL
+#include <stddef.h>
+
/*
* The structure returned by 'localeconv'.
*/