diff --git a/arch/avr32/mach-at32ap/at32ap700x.c b/arch/avr32/mach-at32ap/at32ap700x.c
index aa677e2a3823d89272ed42a367400be93598c2fa..1b7ad97524b81c68c6eea66f0eeb5139cc1c828f 100644
--- a/arch/avr32/mach-at32ap/at32ap700x.c
+++ b/arch/avr32/mach-at32ap/at32ap700x.c
@@ -1044,7 +1044,7 @@ void __init at32_map_usart(unsigned int hw_id, unsigned int line, int flags)
 	}
 
 	pdata = pdev->dev.platform_data;
-	pdata->num = portnr;
+	pdata->num = line;
 	at32_usarts[line] = pdev;
 }