diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index 2ad5c2a..92c0f0b 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -1303,8 +1303,7 @@
 
 server1.req.sha256.ext: server1.key
 	# Generating this with OpenSSL as a comparison point to test we're getting the same result
-	openssl req -new -out $@ -key $< -subj '/C=NL/O=PolarSSL/CN=PolarSSL Server 1' -sha256 -addext "extendedKeyUsage=serverAuth" -addext "subjectAltName=URI:http://pki.example.com/,IP:127.1.1.0,DNS:example.com"
-all_final += server1.req.sha256.ext
+	openssl req -new -out $@ -key $< -subj '/C=NL/O=PolarSSL/CN=PolarSSL Server 1' -sha256 -config server1.req.sha256.conf
 
 parse_input/server1.req.sha384 server1.req.sha384: server1.key
 	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$< subject_name="C=NL,O=PolarSSL,CN=PolarSSL Server 1" md=SHA384
diff --git a/tests/data_files/server1.req.sha256.conf b/tests/data_files/server1.req.sha256.conf
new file mode 100644
index 0000000..0d35818
--- /dev/null
+++ b/tests/data_files/server1.req.sha256.conf
@@ -0,0 +1,17 @@
+req_extensions = req_ext
+
+[req_ext]
+extendedKeyUsage = serverAuth
+subjectAltName = @alt_names
+
+[alt_names]
+email = mail@example.com
+DNS = example.com
+dirName = dirname_sect
+IP = 127.0.0.1
+URI = http://pki.example.com
+
+[dirname_sect]
+C=UK
+O=Mbed TLS
+CN=Mbed TLS directoryName SAN
diff --git a/tests/data_files/server1.req.sha256.ext b/tests/data_files/server1.req.sha256.ext
index c5ff5c5..1bb05da 100644
--- a/tests/data_files/server1.req.sha256.ext
+++ b/tests/data_files/server1.req.sha256.ext
@@ -1,18 +1,20 @@
 -----BEGIN CERTIFICATE REQUEST-----
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-XwFI5s34fen2DUVw6MWNfbDK
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+XORQgR66Sdrvfhiug+F5xmldCg==
 -----END CERTIFICATE REQUEST-----