diff --git a/src/autoreplace_gui.cpp b/src/autoreplace_gui.cpp
--- a/src/autoreplace_gui.cpp
+++ b/src/autoreplace_gui.cpp
@@ -416,8 +416,8 @@ public:
 			case WID_RV_LEFT_MATRIX:
 			case WID_RV_RIGHT_MATRIX: {
 				int side = (widget == WID_RV_LEFT_MATRIX) ? 0 : 1;
-				EngineID start  = this->vscroll[side]->GetPosition(); // what is the offset for the start (scrolling)
-				EngineID end    = min(this->vscroll[side]->GetCapacity() + start, (uint)this->engines[side].size());
+				EngineID start  = static_cast<EngineID>(this->vscroll[side]->GetPosition()); // what is the offset for the start (scrolling)
+				EngineID end    = static_cast<EngineID>(std::min<size_t>(this->vscroll[side]->GetCapacity() + start, this->engines[side].size()));
 
 				/* Do the actual drawing */
 				DrawEngineList((VehicleType)this->window_number, r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, r.top + WD_FRAMERECT_TOP,
@@ -475,7 +475,7 @@ public:
 					NWidgetBase *nwi = this->GetWidget<NWidgetBase>(side == 0 ? WID_RV_LEFT_DETAILS : WID_RV_RIGHT_DETAILS);
 					int text_end = DrawVehiclePurchaseInfo(nwi->pos_x + WD_FRAMETEXT_LEFT, nwi->pos_x + nwi->current_x - WD_FRAMETEXT_RIGHT,
 							nwi->pos_y + WD_FRAMERECT_TOP, this->sel_engine[side], ted);
-					needed_height = max(needed_height, text_end - (int)nwi->pos_y + WD_FRAMERECT_BOTTOM);
+					needed_height = std::max(needed_height, text_end - (int)nwi->pos_y + WD_FRAMERECT_BOTTOM);
 				}
 			}
 			if (needed_height != this->details_height) { // Details window are not high enough, enlarge them.