diff --git a/cmd/upl.c b/cmd/upl.c
index c974588..4996f36 100644
--- a/cmd/upl.c
+++ b/cmd/upl.c
@@ -72,7 +72,7 @@
 		return CMD_RET_FAILURE;
 	}
 	addr = map_to_sysmem(abuf_data(&buf));
-	printf("UPL handoff written to %lx size %lx\n", addr, abuf_size(&buf));
+	printf("UPL handoff written to %lx size %zx\n", addr, abuf_size(&buf));
 	if (env_set_hex("upladdr", addr) ||
 	    env_set_hex("uplsize", abuf_size(&buf))) {
 		printf("Cannot set env var\n");