diff --git a/library/version_features.c b/library/version_features.c
index f665a23..40c9520 100644
--- a/library/version_features.c
+++ b/library/version_features.c
@@ -267,6 +267,9 @@
 #if defined(MBEDTLS_CAMELLIA_SMALL_MEMORY)
     "MBEDTLS_CAMELLIA_SMALL_MEMORY",
 #endif /* MBEDTLS_CAMELLIA_SMALL_MEMORY */
+#if defined(MBEDTLS_CHECK_RETURN_WARNING)
+    "MBEDTLS_CHECK_RETURN_WARNING",
+#endif /* MBEDTLS_CHECK_RETURN_WARNING */
 #if defined(MBEDTLS_CIPHER_MODE_CBC)
     "MBEDTLS_CIPHER_MODE_CBC",
 #endif /* MBEDTLS_CIPHER_MODE_CBC */