--- tests/tlsexttest.c.orig	Sat Aug 22 18:51:52 2020
+++ tests/tlsexttest.c	Fri Sep  4 04:04:26 2020
@@ -1658,7 +1658,9 @@
 };
 
 static unsigned char tlsext_sni_server[] = {
+	0x00
 };
+const size_t sizeof_tlsext_sni_server = 0;
 
 static int
 test_tlsext_sni_client(void)
@@ -1821,9 +1823,9 @@
 	if (!CBB_finish(&cbb, &data, &dlen))
 		errx(1, "failed to finish CBB");
 
-	if (dlen != sizeof(tlsext_sni_server)) {
+	if (dlen != sizeof_tlsext_sni_server) {
 		FAIL("got server SNI with length %zu, "
-		    "want length %zu\n", dlen, sizeof(tlsext_sni_server));
+		    "want length %zu\n", dlen, sizeof_tlsext_sni_server);
 		goto err;
 	}
 
@@ -1832,14 +1834,14 @@
 		fprintf(stderr, "received:\n");
 		hexdump(data, dlen);
 		fprintf(stderr, "test data:\n");
-		hexdump(tlsext_sni_server, sizeof(tlsext_sni_server));
+		hexdump(tlsext_sni_server, sizeof_tlsext_sni_server);
 		goto err;
 	}
 
 	free(ssl->session->tlsext_hostname);
 	ssl->session->tlsext_hostname = NULL;
 
-	CBS_init(&cbs, tlsext_sni_server, sizeof(tlsext_sni_server));
+	CBS_init(&cbs, tlsext_sni_server, sizeof_tlsext_sni_server);
 	if (!tlsext_sni_client_parse(ssl, SSL_TLSEXT_MSG_SH, &cbs, &alert)) {
 		FAIL("failed to parse server SNI\n");
 		goto err;
@@ -2723,7 +2725,10 @@
 	0x04, 0x03, 0x02, 0x01, 0x02, 0x03,
 };
 
-unsigned char tlsext_clienthello_disabled[] = {};
+unsigned char tlsext_clienthello_disabled[] = {
+	0x00
+};
+const size_t sizeof_tlsext_clienthello_disabled = 0;
 
 static int
 test_tlsext_clienthello_build(void)
@@ -2788,18 +2793,18 @@
 	if (!CBB_finish(&cbb, &data, &dlen))
 		errx(1, "failed to finish CBB");
 
-	if (dlen != sizeof(tlsext_clienthello_disabled)) {
+	if (dlen != sizeof_tlsext_clienthello_disabled) {
 		FAIL("got clienthello extensions with length %zu, "
 		    "want length %zu\n", dlen,
-		    sizeof(tlsext_clienthello_disabled));
+		    sizeof_tlsext_clienthello_disabled);
 		compare_data(data, dlen, tlsext_clienthello_disabled,
-		    sizeof(tlsext_clienthello_disabled));
+		    sizeof_tlsext_clienthello_disabled);
 		goto err;
 	}
 	if (memcmp(data, tlsext_clienthello_disabled, dlen) != 0) {
 		FAIL("clienthello extensions differs:\n");
 		compare_data(data, dlen, tlsext_clienthello_disabled,
-		    sizeof(tlsext_clienthello_disabled));
+		    sizeof_tlsext_clienthello_disabled);
 		goto err;
 	}