diff --git a/tools/fiptool/fiptool.c b/tools/fiptool/fiptool.c
index 542a946..0503696 100644
--- a/tools/fiptool/fiptool.c
+++ b/tools/fiptool/fiptool.c
@@ -646,7 +646,7 @@
 	unsigned long align;
 
 	errno = 0;
-	align = strtoul(arg, &endptr, 10);
+	align = strtoul(arg, &endptr, 0);
 	if (*endptr != '\0' || !is_power_of_2(align) || errno != 0)
 		log_errx("Invalid alignment: %s", arg);