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-rw-r--r--kern/sprintf.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/kern/sprintf.h b/kern/sprintf.h
index 0c097953..0c3fb839 100644
--- a/kern/sprintf.h
+++ b/kern/sprintf.h
@@ -28,6 +28,9 @@
#ifndef _KERN_SPRINTF_H
#define _KERN_SPRINTF_H
+#ifndef _STDIO_H
+#error "do not use <kern/sprintf.h> directly; include <stdio.h> instead"
+#endif /* _STDIO_H */
#include <stdarg.h>
#include <kern/macros.h>