diff --git a/drivers/net/can/usb/ucan.c b/drivers/net/can/usb/ucan.c
index 39a63b7313a4..c8a37fd66372 100644
--- a/drivers/net/can/usb/ucan.c
+++ b/drivers/net/can/usb/ucan.c
@@ -1315,7 +1315,9 @@ static int ucan_probe(struct usb_interface *intf,
 	u8 out_ep_addr;
 	union ucan_ctl_payload *ctl_msg_buffer;
 	char firmware_str[sizeof(union ucan_ctl_payload) + 1];
-
+	printk(KERN_INFO "firmware_str size: %zu bytes\n", sizeof(firmware_str));
+	printk(KERN_INFO "union ucan_ctl_payload size: %zu bytes\n", sizeof(union ucan_ctl_payload));
+	printk(KERN_INFO "ip->ctl_msg_buffer->raw size: %zu bytes\n", sizeof(up->ctl_msg_buffer->raw));
 	udev = interface_to_usbdev(intf);
 
 	/* Stage 1 - Interface Parsing