diff --git a/vio/viosslfactories.cc b/vio/viosslfactories.cc
index c25117bd0fb..cb9b19565af 100644
--- a/vio/viosslfactories.cc
+++ b/vio/viosslfactories.cc
@@ -726,6 +726,7 @@ static struct st_VioSSLFd *new_VioSSLFd(
   /* DH stuff */
   dh = get_dh2048();
   if (SSL_CTX_set_tmp_dh(ssl_fd->ssl_context, dh) == 0) {
+    printf("%s\n", ERR_error_string(ERR_get_error(), NULL));
     DH_free(dh);
     *error = SSL_INITERR_DHFAIL;
     goto error;