diff --git a/Gtk3/gtk18/main.cpp b/Gtk3/gtk18/main.cpp
index 79dd61c..43707c1 100644
--- a/Gtk3/gtk18/main.cpp
+++ b/Gtk3/gtk18/main.cpp
@@ -42,5 +42,6 @@ int main(int argc,char *argv[]){
     app=gtk_application_new("com.github.daleclack.gtk18",G_APPLICATION_FLAGS_NONE);
     g_signal_connect(app,"activate",G_CALLBACK(activate),NULL);
     status=g_application_run(G_APPLICATION(app),argc,argv);
+    g_object_unref(app);
     return status;
 }