--- a/src/csr.c
+++ b/src/csr.c
@@ -38,7 +38,7 @@ static LUA_FUNCTION(openssl_csr_read)
   return openssl_pushresult(L, 0);
 }
 
-
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
 static X509 *X509_REQ_to_X509_ex(X509_REQ *r, int days, EVP_PKEY *pkey, const EVP_MD* md)
 {
   X509 *ret = NULL;
@@ -91,14 +91,19 @@ static X509 *X509_REQ_to_X509_ex(X509_RE
   }
   return (ret);
 }
+#endif
 
 static LUA_FUNCTION(openssl_csr_to_x509)
 {
   X509_REQ * csr  = CHECK_OBJECT(1, X509_REQ, "openssl.x509_req");
   EVP_PKEY * pkey = CHECK_OBJECT(2, EVP_PKEY, "openssl.evp_pkey");
   int days = luaL_optint(L, 3, 365);
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
   const EVP_MD* md = get_digest(L, 4, "sha256");
   X509* cert = X509_REQ_to_X509_ex(csr, days, pkey, md);
+#else
+  X509* cert = X509_REQ_to_X509(csr, days, pkey);
+#endif
   if (cert)
   {
     PUSH_OBJECT(cert, "openssl.x509");
