diff --git a/src/autoreplace_gui.cpp b/src/autoreplace_gui.cpp
index 4b11d968c3..bca985bf08 100644
--- a/src/autoreplace_gui.cpp
+++ b/src/autoreplace_gui.cpp
@@ -494,9 +494,9 @@ static const NWidgetPart _nested_replace_rail_vehicle_widgets[] = {
 		NWidget(WWT_STICKYBOX, COLOUR_GREY, RVW_WIDGET_STICKY),
 	EndContainer(),
 	NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
-		NWidget(WWT_MATRIX, COLOUR_GREY, RVW_WIDGET_LEFT_MATRIX), SetMinimalSize(216, 0), SetDataTip(0x1, STR_REPLACE_HELP_LEFT_ARRAY), SetResize(1, 1),
+		NWidget(WWT_MATRIX, COLOUR_GREY, RVW_WIDGET_LEFT_MATRIX), SetMinimalSize(216, 0), SetFill(1, 1), SetDataTip(0x1, STR_REPLACE_HELP_LEFT_ARRAY), SetResize(1, 1),
 		NWidget(WWT_SCROLLBAR, COLOUR_GREY, RVW_WIDGET_LEFT_SCROLLBAR),
-		NWidget(WWT_MATRIX, COLOUR_GREY, RVW_WIDGET_RIGHT_MATRIX), SetMinimalSize(216, 0), SetDataTip(0x1, STR_REPLACE_HELP_RIGHT_ARRAY), SetResize(1, 1),
+		NWidget(WWT_MATRIX, COLOUR_GREY, RVW_WIDGET_RIGHT_MATRIX), SetMinimalSize(216, 0), SetFill(1, 1), SetDataTip(0x1, STR_REPLACE_HELP_RIGHT_ARRAY), SetResize(1, 1),
 		NWidget(WWT_SCROLL2BAR, COLOUR_GREY, RVW_WIDGET_RIGHT_SCROLLBAR),
 	EndContainer(),
 	NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),