diff --git a/net/ieee802154/wpan-class.c b/net/ieee802154/wpan-class.c
index a10ae5be6adb56badd698996478b44809314ccfd..68ccde63155b7a1a1d055b177cce2c5a1edd4414 100644
--- a/net/ieee802154/wpan-class.c
+++ b/net/ieee802154/wpan-class.c
@@ -30,7 +30,7 @@ static ssize_t name ## _show(struct device *dev,			\
 	int ret;							\
 									\
 	mutex_lock(&phy->pib_lock);					\
-	ret = sprintf(buf, format_string "\n", args);			\
+	ret = snprintf(buf, PAGE_SIZE, format_string "\n", args);	\
 	mutex_unlock(&phy->pib_lock);					\
 	return ret;							\
 }