diff --git a/library/asn1write.c b/library/asn1write.c
index 775a9ef..415357b 100644
--- a/library/asn1write.c
+++ b/library/asn1write.c
@@ -412,6 +412,7 @@
     } else if (val_len == 0) {
         mbedtls_free(cur->val.p);
         cur->val.p = NULL;
+        cur->val.len = 0;
     } else if (cur->val.len != val_len) {
         /*
          * Enlarge existing value buffer if needed
diff --git a/tests/suites/test_suite_x509write.data b/tests/suites/test_suite_x509write.data
index 7bd5e74..56af0ce 100644
--- a/tests/suites/test_suite_x509write.data
+++ b/tests/suites/test_suite_x509write.data
@@ -269,11 +269,11 @@
 X509 String to Names (repeated OID, 1st is zero-length)
 mbedtls_x509_string_to_names:"CN=#0400,CN=cd,CN=ef":"CN=ef":0:0
 
-#X509 String to Names (repeated OID, middle is zero-length)
-#mbedtls_x509_string_to_names:"CN=ab,CN=#0400,CN=ef":"CN=ef":0:0
+X509 String to Names (repeated OID, middle is zero-length)
+mbedtls_x509_string_to_names:"CN=ab,CN=#0400,CN=ef":"CN=ef":0:0
 
-#X509 String to Names (repeated OID, last is zero-length)
-#mbedtls_x509_string_to_names:"CN=ab,CN=cd,CN=#0400":"CN=ef":0:0
+X509 String to Names (repeated OID, last is zero-length)
+mbedtls_x509_string_to_names:"CN=ab,CN=cd,CN=#0400":"CN=#0000":0:MAY_FAIL_GET_NAME
 
 X509 Round trip test (Escaped characters)
 mbedtls_x509_string_to_names:"CN=Lu\\C4\\8Di\\C4\\87, O=Offspark, OU=PolarSSL":"CN=Lu\\C4\\8Di\\C4\\87, O=Offspark, OU=PolarSSL":0:0