diff --git a/tests/data_files/ec_prv.noopt.der b/tests/data_files/ec_prv.noopt.der
new file mode 100644
index 0000000..fde16a1
--- /dev/null
+++ b/tests/data_files/ec_prv.noopt.der
Binary files differ
diff --git a/tests/suites/test_suite_pkparse.data b/tests/suites/test_suite_pkparse.data
index b502017..aab568d 100644
--- a/tests/suites/test_suite_pkparse.data
+++ b/tests/suites/test_suite_pkparse.data
@@ -146,6 +146,10 @@
 depends_on:POLARSSL_PEM_PARSE_C:POLARSSL_ECP_C:POLARSSL_ECP_DP_SECP192R1_ENABLED
 pk_parse_keyfile_ec:"data_files/ec_prv.sec1.der":"NULL":0
 
+Parse EC Key #1a (SEC1 DER, no optional part)
+depends_on:POLARSSL_PEM_PARSE_C:POLARSSL_ECP_C:POLARSSL_ECP_DP_SECP256R1_ENABLED
+pk_parse_keyfile_ec:"data_files/ec_prv.noopt.der":"NULL":0
+
 Parse EC Key #2 (SEC1 PEM)
 depends_on:POLARSSL_PEM_PARSE_C:POLARSSL_ECP_C:POLARSSL_ECP_DP_SECP192R1_ENABLED
 pk_parse_keyfile_ec:"data_files/ec_prv.sec1.pem":"NULL":0