diff --git a/src/fl_boxtype.cxx b/src/fl_boxtype.cxx
index bde2b469e..ab957b705 100644
--- a/src/fl_boxtype.cxx
+++ b/src/fl_boxtype.cxx
@@ -297,8 +297,8 @@ static struct {
   {fl_down_box,		2,2,4,4,0}, // _FL_GLEAM_DOWN_BOX
   {fl_up_frame,		2,2,4,4,0}, // _FL_GLEAM_UP_FRAME
   {fl_down_frame,	2,2,4,4,0}, // _FL_GLEAM_DOWN_FRAME
-  {fl_up_box,		1,1,2,2,0}, // _FL_GLEAM_THIN_UP_BOX
-  {fl_down_box,		1,1,2,2,0}, // _FL_GLEAM_THIN_DOWN_BOX
+  {fl_up_box,		2,2,4,4,0}, // _FL_GLEAM_THIN_UP_BOX
+  {fl_down_box,		2,2,4,4,0}, // _FL_GLEAM_THIN_DOWN_BOX
   {fl_up_box,	       	2,2,4,4,0}, // _FL_GLEAM_ROUND_UP_BOX
   {fl_down_box,		2,2,4,4,0}, // _FL_GLEAM_ROUND_DOWN_BOX
   {fl_up_box,		3,3,6,6,0}, // FL_FREE_BOX+0