diff --git a/src/slic3r/GUI/GUI_ObjectList.cpp b/src/slic3r/GUI/GUI_ObjectList.cpp
index 576202594..0229962ea 100644
--- a/src/slic3r/GUI/GUI_ObjectList.cpp
+++ b/src/slic3r/GUI/GUI_ObjectList.cpp
@@ -211,8 +211,8 @@ ObjectList::ObjectList(wxWindow* parent) :
         this->Bind(wxEVT_MENU, [this](wxCommandEvent &evt) { this->remove();                    }, wxID_DELETE);
         this->Bind(wxEVT_MENU, [this](wxCommandEvent &evt) { this->undo();  					}, wxID_UNDO);
         this->Bind(wxEVT_MENU, [this](wxCommandEvent &evt) { this->redo();                    	}, wxID_REDO);
-        this->Bind(wxEVT_MENU, [this](wxCommandEvent &evt) { this->increase_instance();         }, wxID_ADD);
-        this->Bind(wxEVT_MENU, [this](wxCommandEvent &evt) { this->decrease_instance();         }, wxID_REMOVE);
+        this->Bind(wxEVT_MENU, [this](wxCommandEvent &evt) { this->increase_instances();        }, wxID_ADD);
+        this->Bind(wxEVT_MENU, [this](wxCommandEvent &evt) { this->decrease_instances();        }, wxID_REMOVE);
     }
 #else //__WXOSX__
     Bind(wxEVT_CHAR, [this](wxKeyEvent& event) { key_event(event); }); // doesn't work on OSX