diff --git a/src/or/config.c b/src/or/config.c
index 6f774b2605..b0e66ccd26 100644
--- a/src/or/config.c
+++ b/src/or/config.c
@@ -3517,12 +3517,14 @@ options_validate(or_options_t *old_options, or_options_t *options,
       REJECT("Versioning authoritative dir servers must set "
              "Recommended*Versions.");
 
+#ifdef HAVE_MODULE_DIRAUTH
     char *t;
     /* Call these functions to produce warnings only. */
     t = format_recommended_version_list(options->RecommendedClientVersions, 1);
     tor_free(t);
     t = format_recommended_version_list(options->RecommendedServerVersions, 1);
     tor_free(t);
+#endif
 
     if (options->UseEntryGuards) {
       log_info(LD_CONFIG, "Authoritative directory servers can't set "