diff --git a/Lib/test/certdata/cert3.pem b/Lib/test/certdata/cert3.pem
index 034bc43ff1974e..4ab0f5ff133e3f 100644
--- a/Lib/test/certdata/cert3.pem
+++ b/Lib/test/certdata/cert3.pem
@@ -31,4 +31,4 @@ zqmtEM65ceSP8lo8Zbrcy+AEkCulFaZ92tyjtbe8oN4wTmTLFw06oFLSZzuiOgDV
 OaphdVKf/pvA6KBpr6izox0KQFIE5z3AAJZfKzMGDDD20xhy7jjQZNMAhjfsT+k4
 SeYB/6KafNxq08uoulj7w4Z4R/EGpkXnU96ZHYHmvGN0RnxwI1cpYHCazG8AjsK/
 anN9brBi5twTGrn+D8LRBqF5Yn+2MKkD0EdXJdtIENHP+32sPQ==
------END CERTIFICATE-----
\ No newline at end of file
+-----END CERTIFICATE-----
diff --git a/Lib/test/certdata/make_ssl_certs.py b/Lib/test/certdata/make_ssl_certs.py
index 6626b93976a585..ed2037c1fdff04 100644
--- a/Lib/test/certdata/make_ssl_certs.py
+++ b/Lib/test/certdata/make_ssl_certs.py
@@ -254,6 +254,8 @@ def print_cert(path):
         f.write(key)
         f.write(cert)
 
+    check_call(['openssl', 'x509', '-outform', 'pem', '-in', 'keycert3.pem', '-out', 'cert3.pem'])
+
     cert, key = make_cert_key('fakehostname', sign=True)
     with open('keycert4.pem', 'w') as f:
         f.write(key)