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-rw-r--r--src/include/gpxe/xfer.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/include/gpxe/xfer.h b/src/include/gpxe/xfer.h
index 9575bf69..e592fa38 100644
--- a/src/include/gpxe/xfer.h
+++ b/src/include/gpxe/xfer.h
@@ -149,8 +149,8 @@ extern int xfer_deliver_raw ( struct xfer_interface *xfer,
const void *data, size_t len );
extern int xfer_vprintf ( struct xfer_interface *xfer,
const char *format, va_list args );
-extern int xfer_printf ( struct xfer_interface *xfer,
- const char *format, ... );
+extern int __attribute__ (( format ( printf, 2, 3 ) ))
+xfer_printf ( struct xfer_interface *xfer, const char *format, ... );
extern int xfer_seek ( struct xfer_interface *xfer, off_t offset, int whence );
extern void ignore_xfer_close ( struct xfer_interface *xfer, int rc );