diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index 3345237b65..d1dafe043d 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -1324,6 +1324,12 @@ server2-sha256.crt: server2.req.sha256
 	$(MBEDTLS_CERT_WRITE) request_file=server2.req.sha256 serial=2 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20190210144406 not_after=20290210144406 md=SHA256 version=3 output_file=$@
 all_final += server2-sha256.crt
 
+# server3*
+
+server3.crt: server3.key
+	$(MBEDTLS_CERT_WRITE) subject_key=$< subject_name="C=NL,O=PolarSSL,CN=localhost" serial=13 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20190210144406 not_after=20290210144406 md=SHA1 version=3 output_file=$@
+all_final += server3.crt
+
 # MD5 test certificate
 
 cert_md_test_key = $(cli_crt_key_file_rsa)