diff --git a/library/oid.c b/library/oid.c
index 24018d65de..7b54054de2 100644
--- a/library/oid.c
+++ b/library/oid.c
@@ -533,10 +533,6 @@ static const oid_md_alg_t oid_md_alg[] =
         { ADD_LEN( OID_DIGEST_ALG_SHA1 ),      "id-sha1",      "SHA-1" },
         POLARSSL_MD_SHA1,
     },
-    {
-        { ADD_LEN( OID_DIGEST_ALG_SHA1 ),      "id-sha1",      "SHA-1" },
-        POLARSSL_MD_SHA1,
-    },
     {
         { ADD_LEN( OID_DIGEST_ALG_SHA224 ),    "id-sha224",    "SHA-224" },
         POLARSSL_MD_SHA224,