diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
index 5bab8e5..40ef4da 100644
--- a/drivers/usb/class/usbtmc.c
+++ b/drivers/usb/class/usbtmc.c
@@ -463,7 +463,7 @@
 
 		/* Ensure the instrument doesn't lie about it */
 		if(n_characters > actual - 12) {
-			dev_err(dev, "Device lies about message size: %zu > %zu\n", n_characters, actual - 12);
+			dev_err(dev, "Device lies about message size: %u > %d\n", n_characters, actual - 12);
 			n_characters = actual - 12;
 		}