diff --git a/include/event2/dns.h b/include/event2/dns.h
index ca0da3c9..6677d4e2 100644
--- a/include/event2/dns.h
+++ b/include/event2/dns.h
@@ -420,7 +420,7 @@ int evdns_base_set_option(struct evdns_base *base, const char *option, const cha
 
   @param base the evdns_base to which to apply this operation
   @param flags any of DNS_OPTION_NAMESERVERS|DNS_OPTION_SEARCH|DNS_OPTION_MISC|
-    DNS_OPTIONS_HOSTSFILE|DNS_OPTIONS_ALL
+    DNS_OPTION_HOSTSFILE|DNS_OPTIONS_ALL
   @param filename the path to the resolv.conf file
   @return 0 if successful, or various positive error codes if an error
     occurred (see above)