diff --git a/include/polarssl/config.h b/include/polarssl/config.h
index 4861ee1..89fd261 100644
--- a/include/polarssl/config.h
+++ b/include/polarssl/config.h
@@ -148,6 +148,7 @@
 //#define POLARSSL_MD2_ALT
 //#define POLARSSL_MD4_ALT
 //#define POLARSSL_MD5_ALT
+//#define POLARSSL_RIPEMD160_ALT
 //#define POLARSSL_SHA1_ALT
 //#define POLARSSL_SHA256_ALT
 //#define POLARSSL_SHA512_ALT