diff --git a/library/certs.c b/library/certs.c
index 4ae3c24e3..7cc71ae83 100644
--- a/library/certs.c
+++ b/library/certs.c
@@ -180,6 +180,10 @@ const size_t mbedtls_test_ca_crt_rsa_len = sizeof( mbedtls_test_ca_crt_rsa );
 
 #if defined(MBEDTLS_SHA256_C)
 /* tests/data_files/server2-sha256.crt */
+/* Or more precisely, this is the contents of the version of this file
+ * that's in the mbedtls-2.16 branch, due to a backporting mistake.
+ * We don't want to change the contents now, as that would change the size
+ * which is part of the ABI, which should be stable in LTS branches. */
 #define TEST_SRV_CRT_RSA_SHA256                                          \
 "-----BEGIN CERTIFICATE-----\r\n"                                        \
 "MIIDNzCCAh+gAwIBAgIBAjANBgkqhkiG9w0BAQsFADA7MQswCQYDVQQGEwJOTDER\r\n"   \
diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index 658aa2297..3f7a7696d 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -94,6 +94,11 @@ $(test_ca_crt_cat21): $(test_ca_crt) $(test_ca_crt_file_ec)
 	cat $(test_ca_crt_file_ec) $(test_ca_crt) > $@
 all_final += $(test_ca_crt_cat21)
 
+test_ca_crt_cat12u = test-ca_cat12u.crt
+$(test_ca_crt_cat12u): $(test_ca_crt) $(test_ca_crt_file_ec)
+	cat $(test_ca_crt) $(test_ca_crt_file_ec) test-ca_utf8.crt > $@
+all_final += $(test_ca_crt_cat12u)
+
 test-int-ca.csr: test-int-ca.key $(test_ca_config_file)
 	$(OPENSSL) req -new -config $(test_ca_config_file) -key test-int-ca.key -subj "/C=NL/O=PolarSSL/CN=PolarSSL Test Intermediate CA" -out $@
 all_intermediate += test-int-ca.csr
diff --git a/tests/data_files/test-ca_cat12u.crt b/tests/data_files/test-ca_cat12u.crt
new file mode 100644
index 000000000..4ebd5e925
--- /dev/null
+++ b/tests/data_files/test-ca_cat12u.crt
@@ -0,0 +1,56 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 9e24d5b05..26ea12430 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -37,7 +37,7 @@ ulimit -f 20971520
 O_SRV="$OPENSSL_CMD s_server -www -cert data_files/server5.crt -key data_files/server5.key"
 O_CLI="echo 'GET / HTTP/1.0' | $OPENSSL_CMD s_client"
 G_SRV="$GNUTLS_SERV --x509certfile data_files/server5.crt --x509keyfile data_files/server5.key"
-G_CLI="echo 'GET / HTTP/1.0' | $GNUTLS_CLI --x509cafile data_files/test-ca_cat12.crt"
+G_CLI="echo 'GET / HTTP/1.0' | $GNUTLS_CLI --x509cafile data_files/test-ca_cat12u.crt"
 TCP_CLIENT="$PERL scripts/tcp_client.pl"
 
 TESTS=0
@@ -3772,15 +3772,8 @@ run_test    "Per-version suites: TLS 1.2" \
 # Test for ClientHello without extensions
 
 requires_gnutls
-run_test    "ClientHello without extensions, SHA-1 allowed" \
-            "$P_SRV debug_level=3 key_file=data_files/server2.key crt_file=data_files/server2.crt" \
-            "$G_CLI --priority=NORMAL:%NO_EXTENSIONS:%DISABLE_SAFE_RENEGOTIATION" \
-            0 \
-            -s "dumping 'client hello extensions' (0 bytes)"
-
-requires_gnutls
-run_test    "ClientHello without extensions, SHA-1 forbidden in certificates on server" \
-            "$P_SRV debug_level=3 key_file=data_files/server2.key crt_file=data_files/server2.crt allow_sha1=0" \
+run_test    "ClientHello without extensions" \
+            "$P_SRV debug_level=3" \
             "$G_CLI --priority=NORMAL:%NO_EXTENSIONS:%DISABLE_SAFE_RENEGOTIATION" \
             0 \
             -s "dumping 'client hello extensions' (0 bytes)"