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-rw-r--r--include/stddef.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/stddef.h b/include/stddef.h
index d4977de..702d91a 100644
--- a/include/stddef.h
+++ b/include/stddef.h
@@ -1,3 +1,6 @@
+#ifndef __DUCC_BUILTIN___STDDEF_H__
+#define __DUCC_BUILTIN___STDDEF_H__
+
#define NULL 0
// TODO: unsigned
@@ -8,3 +11,5 @@ typedef long size_t;
// - nullptr_t (C23)
// - offsetof
// - ptrdiff_t
+
+#endif