diff --git a/library/oid.c b/library/oid.c
index 9f40941..27c455e 100644
--- a/library/oid.c
+++ b/library/oid.c
@@ -627,6 +627,12 @@
         MBEDTLS_MD_SHA512,
     },
 #endif /* MBEDTLS_SHA512_C */
+#if defined(MBEDTLS_RIPEMD160_C)
+    {
+        { ADD_LEN( MBEDTLS_OID_DIGEST_ALG_RIPEMD160 ),       "id-ripemd160",       "RIPEMD-160" },
+        MBEDTLS_MD_RIPEMD160,
+    },
+#endif /* MBEDTLS_RIPEMD160_C */
     {
         { NULL, 0, NULL, NULL },
         MBEDTLS_MD_NONE,