diff --git a/src/slic3r/GUI/Preferences.cpp b/src/slic3r/GUI/Preferences.cpp
index 1ce6fe12d..ae52b52a9 100644
--- a/src/slic3r/GUI/Preferences.cpp
+++ b/src/slic3r/GUI/Preferences.cpp
@@ -9,6 +9,7 @@
 #include "Notebook.hpp"
 #include "ButtonsDescription.hpp"
 #include "OG_CustomCtrl.hpp"
+#include <initializer_list>
 
 namespace Slic3r {
 
@@ -504,7 +505,7 @@ void PreferencesDialog::build(size_t selected_tab)
 void PreferencesDialog::update_ctrls_alignment()
 {
 	int max_ctrl_width{ 0 };
-	std::initializer_list og_list = { m_optgroup_general.get(), m_optgroup_camera.get(), m_optgroup_gui.get() };
+	std::initializer_list<ConfigOptionsGroup*> og_list = { m_optgroup_general.get(), m_optgroup_camera.get(), m_optgroup_gui.get() };
 	for (auto og : og_list) {
 		if (int max = og->custom_ctrl->get_max_win_width();
 			max_ctrl_width < max)