diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c
index bc0449f..b133f3f 100644
--- a/drivers/thunderbolt/eeprom.c
+++ b/drivers/thunderbolt/eeprom.c
@@ -323,7 +323,7 @@
 		struct tb_drom_entry_port *entry = (void *) header;
 		if (header->len != sizeof(*entry)) {
 			tb_sw_warn(sw,
-				"port entry has size %#x (expected %#lx)\n",
+				"port entry has size %#x (expected %#zx)\n",
 				header->len, sizeof(struct tb_drom_entry_port));
 			return -EIO;
 		}