diff --git a/tests/data_files/Readme-x509.txt b/tests/data_files/Readme-x509.txt
index b68ae51..2cf0c66 100644
--- a/tests/data_files/Readme-x509.txt
+++ b/tests/data_files/Readme-x509.txt
@@ -23,6 +23,7 @@
 - test-ca-v1.crt: v1 "CA", signs
     server1-v1.crt: v1 "intermediate CA", signs
         server2-v1*.crt: EE cert (without of with chain in same file)
+- keyUsage.decipherOnly.crt: has the decipherOnly keyUsage bit set
 
 End-entity certificates
 -----------------------
diff --git a/tests/data_files/keyUsage.decipherOnly.crt b/tests/data_files/keyUsage.decipherOnly.crt
new file mode 100644
index 0000000..7c37978
--- /dev/null
+++ b/tests/data_files/keyUsage.decipherOnly.crt
@@ -0,0 +1,14 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/tests/suites/test_suite_x509parse.data b/tests/suites/test_suite_x509parse.data
index 3e1393a..0be6c71 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -90,6 +90,10 @@
 depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_RSA_C
 x509_cert_info:"data_files/server1.key_usage.crt":"cert. version     \: 3\nserial number     \: 01\nissuer name       \: C=NL, O=PolarSSL, CN=PolarSSL Test CA\nsubject name      \: C=NL, O=PolarSSL, CN=PolarSSL Server 1\nissued  on        \: 2011-02-12 14\:44\:06\nexpires on        \: 2021-02-12 14\:44\:06\nsigned using      \: RSA with SHA1\nRSA key size      \: 2048 bits\nbasic constraints \: CA=false\nkey usage         \: Digital Signature, Non Repudiation, Key Encipherment\n"
 
+X509 Certificate information, Key Usage with decipherOnly
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_RSA_C
+x509_cert_info:"data_files/keyUsage.decipherOnly.crt":"cert. version     \: 3\nserial number     \: 9B\:13\:CE\:4C\:A5\:6F\:DE\:52\nissuer name       \: C=GB, L=Cambridge, O=Default Company Ltd\nsubject name      \: C=GB, L=Cambridge, O=Default Company Ltd\nissued  on        \: 2015-05-12 10\:36\:55\nexpires on        \: 2018-05-11 10\:36\:55\nsigned using      \: RSA with SHA1\nRSA key size      \: 1024 bits\nbasic constraints \: CA=false\nkey usage         \: Digital Signature, Non Repudiation, Key Encipherment, Decipher Only\n"
+
 X509 Certificate information, Subject Alt Name
 depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_RSA_C
 x509_cert_info:"data_files/cert_example_multi.crt":"cert. version     \: 3\nserial number     \: 11\nissuer name       \: C=NL, O=PolarSSL, CN=PolarSSL Test CA\nsubject name      \: C=NL, O=PolarSSL, CN=www.example.com\nissued  on        \: 2012-05-10 13\:23\:41\nexpires on        \: 2022-05-11 13\:23\:41\nsigned using      \: RSA with SHA1\nRSA key size      \: 2048 bits\nbasic constraints \: CA=false\nsubject alt name  \: example.com, example.net, *.example.org\n"