diff --git a/sys/kern/subr_bus.c b/sys/kern/subr_bus.c
index bf63baddb2ef..4791f4c6840d 100644
--- a/sys/kern/subr_bus.c
+++ b/sys/kern/subr_bus.c
@@ -2370,7 +2370,7 @@ print_driver_short(driver_t *driver, int indent)
 	if (!driver)
 		return;
 
-	indentprintf(("driver %s: softc size = %d\n",
+	indentprintf(("driver %s: softc size = %zd\n",
 	    driver->name, driver->size));
 }