diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index 6187d17..09a0689 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -276,6 +276,9 @@
 server5-othername.crt: server5.key
 	$(OPENSSL) req -x509 -new -subj "/C=UK/O=Mbed TLS/CN=Mbed TLS othername SAN" -set_serial 77 -config $(test_ca_config_file) -extensions othername_san -days 3650 -sha256 -key $< -out $@
 
+server5-nonprintable_othername.crt: server5.key
+	$(OPENSSL) req -x509 -new -subj "/C=UK/O=Mbed TLS/CN=Mbed TLS non-printable othername SAN" -set_serial 77 -config $(test_ca_config_file) -extensions nonprintable_othername_san -days 3650 -sha256 -key $< -out $@
+
 server5-unsupported_othername.crt: server5.key
 	$(OPENSSL) req -x509 -new -subj "/C=UK/O=Mbed TLS/CN=Mbed TLS unsupported othername SAN" -set_serial 77 -config $(test_ca_config_file) -extensions unsupoported_othername_san -days 3650 -sha256 -key $< -out $@
 
diff --git a/tests/data_files/server5-nonprintable_othername.crt b/tests/data_files/server5-nonprintable_othername.crt
new file mode 100644
index 0000000..9470bbe
--- /dev/null
+++ b/tests/data_files/server5-nonprintable_othername.crt
@@ -0,0 +1,12 @@
+-----BEGIN CERTIFICATE-----
+MIIBwTCCAWagAwIBAgIBTTAKBggqhkjOPQQDAjBPMQswCQYDVQQGEwJVSzERMA8G
+A1UECgwITWJlZCBUTFMxLTArBgNVBAMMJE1iZWQgVExTIG5vbi1wcmludGFibGUg
+b3RoZXJuYW1lIFNBTjAeFw0yMjA5MDYxNTU2NDdaFw0zMjA5MDMxNTU2NDdaME8x
+CzAJBgNVBAYTAlVLMREwDwYDVQQKDAhNYmVkIFRMUzEtMCsGA1UEAwwkTWJlZCBU
+TFMgbm9uLXByaW50YWJsZSBvdGhlcm5hbWUgU0FOMFkwEwYHKoZIzj0CAQYIKoZI
+zj0DAQcDQgAEN8xW2XYJHlpyPsdZLf8gbu58+QaRdNCtFLX3aCJZYpJO5QDYIxH/
+6i/SNF1dFr2KiMJrdw1VzYoqDvoByLTt/6MzMDEwLwYDVR0RBCgwJqAkBggrBgEF
+BQcIBKAYMBYGBysGAQQBEQMECzEyM4CBAIGAMzIxMAoGCCqGSM49BAMCA0kAMEYC
+IQDATir07PTj5gtf+HAyI+nd27AH9+bdaWdOI2t2bAwUWgIhAO7kvdcsa++yfJdT
+3vnWdvcHRIAdXA0kh+mcBMaXk9B0
+-----END CERTIFICATE-----
diff --git a/tests/data_files/test-ca.opensslconf b/tests/data_files/test-ca.opensslconf
index 64347de..3bb2379 100644
--- a/tests/data_files/test-ca.opensslconf
+++ b/tests/data_files/test-ca.opensslconf
@@ -15,6 +15,9 @@
 [othername_san]
 subjectAltName=otherName:1.3.6.1.5.5.7.8.4;SEQ:hw_module_name
 
+[nonprintable_othername_san]
+subjectAltName=otherName:1.3.6.1.5.5.7.8.4;SEQ:nonprintable_hw_module_name
+
 [unsupoported_othername_san]
 subjectAltName=otherName:1.2.3.4;UTF8:some other identifier
 
@@ -34,6 +37,10 @@
 hwtype = OID:1.3.6.1.4.1.17.3
 hwserial = OCT:123456
 
+[nonprintable_hw_module_name]
+hwtype = OID:1.3.6.1.4.1.17.3
+hwserial = FORMAT:HEX, OCT:3132338081008180333231
+
 [v3_any_policy_ca]
 basicConstraints = CA:true
 certificatePolicies = 2.5.29.32.0