diff --git a/data_files/Makefile b/data_files/Makefile
index 71277b9d8..b8f1c39f2 100644
--- a/data_files/Makefile
+++ b/data_files/Makefile
@@ -469,6 +469,10 @@ server5-selfsigned.crt: server5.key
         -out $@
 all_final += server5-selfsigned.crt
 
+server5-selfsigned.crt.der: server5-selfsigned.crt
+	$(OPENSSL) x509 -inform PEM -in $< -outform DER -out $@
+all_final += server5-selfsigned.crt.der
+
 # Create a certificate which is almost identical to "server3.crt", i.e.
 # it contains a public EC key and it is signed with RSA. The main difference
 # compared to "server3.crt" is that in this case we use a secp256r1 key ("server5.key")
diff --git a/data_files/server5-selfsigned.crt.der b/data_files/server5-selfsigned.crt.der
new file mode 100644
index 000000000..c28be8a26
Binary files /dev/null and b/data_files/server5-selfsigned.crt.der differ