diff --git a/src/gui/main.h b/src/gui/main.h
index 9a44bd44..8cd07381 100644
--- a/src/gui/main.h
+++ b/src/gui/main.h
@@ -82,7 +82,7 @@ private:
     wxButton * _moveUp;
     wxButton * _moveDown;
 
-    std::list<boss::Plugin> _plugins;
+    const std::list<boss::Plugin> _plugins;
     std::set<std::string> _movedPlugins;
 };