diff --git a/util/ectool/ectool.c b/util/ectool/ectool.c
index be5a899765..bc3d46cd52 100644
--- a/util/ectool/ectool.c
+++ b/util/ectool/ectool.c
@@ -90,6 +90,11 @@ int main(int argc, char *argv[])
 		{0, 0, 0, 0}
 	};
 
+	if (argv[1] == NULL) {
+		print_usage(argv[0]);
+		exit(1);
+	}
+
 	while ((opt = getopt_long(argc, argv, "vh?Vidqpw:z:",
 				  long_options, &option_index)) != EOF) {
 		switch (opt) {
@@ -128,6 +133,12 @@ int main(int argc, char *argv[])
 		}
 	}
 
+	if (optind < argc) {
+		fprintf(stderr, "Error: Extra parameter found.\n");
+		print_usage(argv[0]);
+		exit(1);
+	}
+
 	if (get_ports && get_ec_ports() != 0)
 		fprintf(stderr, "Cannot get EC ports from /proc/ioports, "
 				"fallback to default.");