--- a/src/build_vehicle_gui.cpp	Tue Jan 23 00:04:17 2007 +0000
+++ b/src/build_vehicle_gui.cpp	Tue Jan 23 01:00:56 2007 +0000
@@ -739,7 +739,7 @@
  * @param x,y Where should the list start
  * @param eng_list What engines to draw
  * @param min where to start in the list
- * @param max where in the list to end. MAKE SURE THAT THIS IS NOT LONGER THAN THE ENGINE LIST ITSELF!
+ * @param max where in the list to end
  * @param selected_id what engine to highlight as selected, if any
  */
 static void DrawEngineList(byte type, int x, int y, const EngineList eng_list, uint16 min, uint16 max, EngineID selected_id)
@@ -748,6 +748,8 @@
 	byte x_offset = 0;
 	byte y_offset = 0;
 
+	assert(max <= EngList_Count(&eng_list));
+
 	switch (type) {
 		case VEH_Train:
 			x++; // train and road vehicles use the same offset, except trains are one more pixel to the right