diff --git a/real_dbus_wrapper.h b/real_dbus_wrapper.h
index 1535bef..f1ef8b7 100644
--- a/real_dbus_wrapper.h
+++ b/real_dbus_wrapper.h
@@ -45,6 +45,14 @@
                              out1, G_TYPE_INVALID);
   }
 
+  gboolean ProxyCall_0_1(DBusGProxy* proxy,
+                         const char* method,
+                         GError** error,
+                         gint* out1) override {
+    return dbus_g_proxy_call(proxy, method, error, G_TYPE_INVALID,
+                             G_TYPE_INT, out1, G_TYPE_INVALID);
+  }
+
   gboolean ProxyCall_1_0(DBusGProxy* proxy,
                          const char* method,
                          GError** error,