diff --git a/library/version_features.c b/library/version_features.c
index 5404d79..a91723f 100644
--- a/library/version_features.c
+++ b/library/version_features.c
@@ -300,6 +300,9 @@
 #if defined(MBEDTLS_CIPHER_PADDING_ZEROS)
     "MBEDTLS_CIPHER_PADDING_ZEROS",
 #endif /* MBEDTLS_CIPHER_PADDING_ZEROS */
+#if defined(MBEDTLS_CTR_DRBG_USE_128_BIT_KEY)
+    "MBEDTLS_CTR_DRBG_USE_128_BIT_KEY",
+#endif /* MBEDTLS_CTR_DRBG_USE_128_BIT_KEY */
 #if defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED)
     "MBEDTLS_ECP_DP_SECP192R1_ENABLED",
 #endif /* MBEDTLS_ECP_DP_SECP192R1_ENABLED */