diff --git a/src/gtk/window.cpp b/src/gtk/window.cpp
index 991c245fd7..375912170f 100644
--- a/src/gtk/window.cpp
+++ b/src/gtk/window.cpp
@@ -2220,10 +2220,28 @@ size_allocate(GtkWidget* WXUNUSED_IN_GTK2(widget), GtkAllocation* alloc, wxWindo
 #if GTK_CHECK_VERSION(3,14,0)
     if (wx_is_at_least_gtk3(14))
     {
+        // Prevent under-allocated widgets from drawing outside their allocation
         GtkAllocation clip;
         gtk_widget_get_clip(widget, &clip);
         if (clip.width > w || clip.height > h)
-            gtk_widget_set_clip(widget, alloc);
+        {
+            GtkStyleContext* sc = gtk_widget_get_style_context(widget);
+            int outline_offset, outline_width;
+            gtk_style_context_get(sc, gtk_style_context_get_state(sc),
+                "outline-offset", &outline_offset, "outline-width", &outline_width, NULL);
+            const int outline = outline_offset + outline_width;
+            GtkAllocation a = *alloc;
+            if (outline > 0)
+            {
+                // Allow enough room for focus indicator "outline", it's drawn
+                // outside of GtkCheckButton allocation with Adwaita theme
+                a.x -= outline;
+                a.y -= outline;
+                a.width += outline + outline;
+                a.height += outline + outline;
+            }
+            gtk_widget_set_clip(widget, &a);
+        }
     }
 #endif
     if (win->m_wxwindow)