diff --git a/src/viewport_gui.cpp b/src/viewport_gui.cpp
--- a/src/viewport_gui.cpp
+++ b/src/viewport_gui.cpp
@@ -74,14 +74,14 @@ public:
 			const Window *w = FindWindowById(WC_MAIN_WINDOW, 0);
 
 			/* center on same place as main window (zoom is maximum, no adjustment needed) */
-			pt.x = w->viewport->scrollpos_x + w->viewport->virtual_height / 2;
+			pt.x = w->viewport->scrollpos_x + w->viewport->virtual_width / 2;
 			pt.y = w->viewport->scrollpos_y + w->viewport->virtual_height / 2;
 		} else {
 			pt = RemapCoords(TileX(tile) * TILE_SIZE + TILE_SIZE / 2, TileY(tile) * TILE_SIZE + TILE_SIZE / 2, TileHeight(tile));
 		}
 
-		this->viewport->scrollpos_x = pt.x - (nvp->pos_x - ((nvp->current_x - 1) / 2));
-		this->viewport->scrollpos_y = pt.y - (nvp->pos_y - ((nvp->current_y - 1) / 2));
+		this->viewport->scrollpos_x = pt.x - this->viewport->virtual_width / 2;
+		this->viewport->scrollpos_y = pt.y - this->viewport->virtual_height / 2;
 		this->viewport->dest_scrollpos_x = this->viewport->scrollpos_x;
 		this->viewport->dest_scrollpos_y = this->viewport->scrollpos_y;
 	}