diff --git a/src/engine_gui.cpp b/src/engine_gui.cpp
--- a/src/engine_gui.cpp
+++ b/src/engine_gui.cpp
@@ -325,7 +325,7 @@ void DrawVehicleEngine(int left, int rig
  */
 void EngList_Sort(GUIEngineList *el, EngList_SortTypeFunction compare)
 {
-	uint size = el->size();
+	size_t size = el->size();
 	/* out-of-bounds access at the next line for size == 0 (even with operator[] at some systems)
 	 * generally, do not sort if there are less than 2 items */
 	if (size < 2) return;