diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
index 86ff3dd8d3a66..e40487be20386 100644
--- a/drivers/pinctrl/pinctrl-at91-pio4.c
+++ b/drivers/pinctrl/pinctrl-at91-pio4.c
@@ -1144,7 +1144,7 @@ static int atmel_pinctrl_probe(struct platform_device *pdev)
 
 		pin_desc[i].number = i;
 		/* Pin naming convention: P(bank_name)(bank_pin_number). */
-		pin_desc[i].name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "P%c%d",
+		pin_desc[i].name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "P%c%u",
 						  bank + 'A', line);
 
 		group->name = group_names[i] = pin_desc[i].name;