diff --git a/sound/soc/sh/rcar/adg.c b/sound/soc/sh/rcar/adg.c
index 78916332c22f..390d5e22fbb8 100644
--- a/sound/soc/sh/rcar/adg.c
+++ b/sound/soc/sh/rcar/adg.c
@@ -584,6 +584,7 @@ static void rsnd_adg_get_clkout(struct rsnd_priv *priv,
 }
 
 #if defined(DEBUG) || defined(CONFIG_DEBUG_FS)
+__printf(3, 4)
 static void dbg_msg(struct device *dev, struct seq_file *m,
 				   const char *fmt, ...)
 {