diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index dd946e5ba..084b0ab05 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -765,6 +765,13 @@ server2.req.sha256: server2.key
 	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$< subject_name="C=NL,O=PolarSSL,CN=localhost" md=SHA256
 all_intermediate += server2.req.sha256
 
+# server5*
+
+# The use of 'Server 1' in the DN is intentional here, as the DN is hardcoded in the x509_write test suite.'
+server5.req.ku.sha1: server5.key
+	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$< key_usage=digital_signature,non_repudiation subject_name="C=NL,O=PolarSSL,CN=PolarSSL Server 1" md=SHA1
+all_final += server5.req.ku.sha1
+
 ################################################################
 ### Generate certificates for CRT write check tests
 ################################################################