1 files changed, 3 insertions, 2 deletions

diff --git a/arch/powerpc/boot/stdio.h b/arch/powerpc/boot/stdio.h
index 73b8a91bfb3..adffc58412d 100644
--- a/arch/powerpc/boot/stdio.h
+++ b/arch/powerpc/boot/stdio.h
@@ -7,11 +7,12 @@
 #define EINVAL          22      /* Invalid argument */
 #define ENOSPC          28      /* No space left on device */
 
-extern int printf(const char *fmt, ...);
+extern int printf(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
 
 #define fprintf(fmt, args...)   printf(args)
 
-extern int sprintf(char *buf, const char *fmt, ...);
+extern int sprintf(char *buf, const char *fmt, ...)
+        __attribute__((format(printf, 2, 3)));
 
 extern int vsprintf(char *buf, const char *fmt, va_list args);