diff --git a/interface/wx/event.h b/interface/wx/event.h
index 06939b2889..f8cd19f9ec 100644
--- a/interface/wx/event.h
+++ b/interface/wx/event.h
@@ -2608,6 +2608,10 @@ public:
         Returns the integer identifier corresponding to a listbox, choice or
         radiobox selection (only if the event was a selection, not a deselection),
         or a boolean value representing the value of a checkbox.
+
+        For a menu item, this method returns -1 if the item is not checkable or
+        a boolean value (true or false) for checkable items indicating the new
+        state of the item.
     */
     int GetInt() const;
 
diff --git a/src/common/framecmn.cpp b/src/common/framecmn.cpp
index 11d35444bc..17633160c4 100644
--- a/src/common/framecmn.cpp
+++ b/src/common/framecmn.cpp
@@ -271,6 +271,10 @@ bool wxFrameBase::ProcessCommand(wxMenuItem *item)
         // use the new value
         commandEvent.SetInt(item->IsChecked());
     }
+    else // Uncheckable item.
+    {
+        commandEvent.SetInt(-1);
+    }
 
     return HandleWindowEvent(commandEvent);
 }
diff --git a/src/msw/menu.cpp b/src/msw/menu.cpp
index 8e11eeb1d3..3b1871f09d 100644
--- a/src/msw/menu.cpp
+++ b/src/msw/menu.cpp
@@ -949,18 +949,25 @@ bool wxMenu::MSWCommand(WXUINT WXUNUSED(param), WXWORD id_)
     // ignore commands from the menu title
     if ( id != idMenuTitle )
     {
+        // Default value for uncheckable items.
+        int checked = -1;
+
         // update the check item when it's clicked
         wxMenuItem * const item = FindItem(id);
         if ( item && item->IsCheckable() )
+        {
             item->Toggle();
 
-        // get the status of the menu item: note that it has been just changed
-        // by Toggle() above so here we already get the new state of the item
-        //
-        // Also notice that we must pass unsigned id_ and not sign-extended id
-        // to ::GetMenuState() as this is what it expects.
-        UINT menuState = ::GetMenuState(GetHmenu(), id_, MF_BYCOMMAND);
-        SendEvent(id, menuState & MF_CHECKED ? 1 : 0);
+            // Get the status of the menu item: note that it has been just changed
+            // by Toggle() above so here we already get the new state of the item.
+            //
+            // Also notice that we must pass unsigned id_ and not sign-extended id
+            // to ::GetMenuState() as this is what it expects.
+            UINT menuState = ::GetMenuState(GetHmenu(), id_, MF_BYCOMMAND);
+            checked = (menuState & MF_CHECKED) != 0;
+        }
+
+        SendEvent(id, checked);
     }
 
     return true;