diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 389f4e5256fa..c0056c391c7e 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -568,12 +568,13 @@ phy_registers_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct phy_device *phydev = to_phy_device(dev);
 	int index;
+	int len = 0;
 
 	for (index = 0; index < 32; index++)
-		sprintf(buf, "%s%2d: 0x%x\n", buf, index,
-			phy_read(phydev, index));
+		len += sysfs_emit_at(buf, len, "%2d: 0x%x\n", index,
+				     phy_read(phydev, index));
 
-	return strlen(buf);
+	return len;
 }
 
 static ssize_t