diff --git a/library/x509_crt.c b/library/x509_crt.c
index 5d82816..8024b51 100644
--- a/library/x509_crt.c
+++ b/library/x509_crt.c
@@ -820,7 +820,17 @@
             break;
 
         default:
-            return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
+            /*
+             * If this is a non-critical extension, which the oid layer
+             * supports, but there isn't an x509 parser for it,
+             * skip the extension.
+             */
+#if !defined(MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION)
+            if( is_critical )
+                return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
+            else
+#endif
+                *p = end_ext_octet;
         }
     }