diff --git a/src/fios_gui.cpp b/src/fios_gui.cpp
--- a/src/fios_gui.cpp
+++ b/src/fios_gui.cpp
@@ -73,6 +73,7 @@ static const NWidgetPart _nested_load_di
 	NWidget(NWID_HORIZONTAL),
 		NWidget(WWT_CLOSEBOX, COLOUR_GREY),
 		NWidget(WWT_CAPTION, COLOUR_GREY, WID_SL_CAPTION),
+		NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
 	EndContainer(),
 	NWidget(WWT_PANEL, COLOUR_GREY, WID_SL_BACKGROUND), SetFill(1, 0), SetResize(1, 0), EndContainer(),
 	NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
@@ -115,6 +116,7 @@ static const NWidgetPart _nested_load_he
 	NWidget(NWID_HORIZONTAL),
 		NWidget(WWT_CLOSEBOX, COLOUR_GREY),
 		NWidget(WWT_CAPTION, COLOUR_GREY, WID_SL_CAPTION),
+		NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
 	EndContainer(),
 	NWidget(WWT_PANEL, COLOUR_GREY, WID_SL_BACKGROUND), SetFill(1, 0), SetResize(1, 0), EndContainer(),
 	NWidget(NWID_VERTICAL),
@@ -145,6 +147,7 @@ static const NWidgetPart _nested_save_di
 	NWidget(NWID_HORIZONTAL),
 		NWidget(WWT_CLOSEBOX, COLOUR_GREY),
 		NWidget(WWT_CAPTION, COLOUR_GREY, WID_SL_CAPTION),
+		NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
 	EndContainer(),
 	NWidget(WWT_PANEL, COLOUR_GREY, WID_SL_BACKGROUND), SetFill(1, 0), SetResize(1, 0), EndContainer(),
 	NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),