diff --git a/util/options.hh b/util/options.hh
index 0c929a229..1a26697d6 100644
--- a/util/options.hh
+++ b/util/options.hh
@@ -56,12 +56,12 @@ void fail (hb_bool_t suggest_help, const char *format, ...) G_GNUC_NORETURN G_GN
 
 struct option_group_t
 {
-  virtual ~option_group_t () {}
+  virtual ~option_group_t (void) {}
 
   virtual void add_options (struct option_parser_t *parser) = 0;
 
-  virtual void pre_parse (GError **error G_GNUC_UNUSED) {};
-  virtual void post_parse (GError **error G_GNUC_UNUSED) {};
+  virtual void pre_parse (GError **error G_GNUC_UNUSED) {}
+  virtual void post_parse (GError **error G_GNUC_UNUSED) {}
 };