diff --git a/src/univ/themes/gtk.cpp b/src/univ/themes/gtk.cpp
index 51f47cde8f..fad14c9d68 100644
--- a/src/univ/themes/gtk.cpp
+++ b/src/univ/themes/gtk.cpp
@@ -201,9 +201,9 @@ public:
 #endif // wxUSE_SCROLLBAR
 
     virtual wxSize GetCheckBitmapSize() const
-        { return wxSize(10, 10); }
+        { return wxSize(14, 14); }
     virtual wxSize GetRadioBitmapSize() const
-        { return wxSize(11, 11); }
+        { return wxSize(14, 14); }
     virtual wxCoord GetCheckItemMargin() const
         { return 2; }