diff --git a/src/ai/ai_gui.cpp b/src/ai/ai_gui.cpp
--- a/src/ai/ai_gui.cpp
+++ b/src/ai/ai_gui.cpp
@@ -429,12 +429,14 @@ static const NWidgetPart _nested_ai_sett
 		NWidget(WWT_CAPTION, COLOUR_MAUVE, AIS_WIDGET_CAPTION), SetDataTip(STR_AI_SETTINGS_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
 	EndContainer(),
 	NWidget(NWID_HORIZONTAL),
-		NWidget(WWT_MATRIX, COLOUR_MAUVE, AIS_WIDGET_BACKGROUND), SetMinimalSize(188, 182), SetResize(1, 1), SetDataTip(0x501, STR_NULL),
+		NWidget(WWT_MATRIX, COLOUR_MAUVE, AIS_WIDGET_BACKGROUND), SetMinimalSize(188, 182), SetResize(1, 1), SetFill(1, 0), SetDataTip(0x501, STR_NULL),
 		NWidget(WWT_SCROLLBAR, COLOUR_MAUVE, AIS_WIDGET_SCROLLBAR),
 	EndContainer(),
-	NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
-		NWidget(WWT_PUSHTXTBTN, COLOUR_MAUVE, AIS_WIDGET_ACCEPT), SetMinimalSize(94, 12), SetResize(1, 0), SetDataTip(STR_AI_SETTINGS_CLOSE, STR_NULL),
-		NWidget(WWT_PUSHTXTBTN, COLOUR_MAUVE, AIS_WIDGET_RESET), SetMinimalSize(94, 12), SetResize(1, 0), SetDataTip(STR_AI_SETTINGS_RESET, STR_NULL),
+	NWidget(NWID_HORIZONTAL),
+		NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
+			NWidget(WWT_PUSHTXTBTN, COLOUR_MAUVE, AIS_WIDGET_ACCEPT), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_AI_SETTINGS_CLOSE, STR_NULL),
+			NWidget(WWT_PUSHTXTBTN, COLOUR_MAUVE, AIS_WIDGET_RESET), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_AI_SETTINGS_RESET, STR_NULL),
+		EndContainer(),
 		NWidget(WWT_RESIZEBOX, COLOUR_MAUVE, AIS_WIDGET_RESIZE),
 	EndContainer(),
 };