--- a/src/industry_map.h	Sun Aug 03 18:18:36 2008 +0000
+++ b/src/industry_map.h	Sun Aug 03 18:51:13 2008 +0000
@@ -218,7 +218,8 @@
 static inline void ResetIndustryConstructionStage(TileIndex tile)
 {
 	assert(IsTileType(tile, MP_INDUSTRY));
-	_m[tile].m1 = 0;
+	SB(_m[tile].m1, 0, 2, 0);
+	SB(_m[tile].m1, 7, 1, 0);
 }
 
 /**