diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STDDEF_H.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STDDEF_H.h
index 495c174..0328d02 100644
--- a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STDDEF_H.h
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STDDEF_H.h
@@ -1,5 +1,5 @@
-// HAVE_STDLIB_H
+// HAVE_STDDEF_H
 
-#undef HAVE_STDLIB_H
+#undef HAVE_STDDEF_H
 
-#define HAVE_STDLIB_H 1
+#define HAVE_STDDEF_H 1