diff --git a/src/economy_func.h b/src/economy_func.h
--- a/src/economy_func.h
+++ b/src/economy_func.h
@@ -22,7 +22,7 @@ void ResetPriceBaseMultipliers();
 void SetPriceBaseMultiplier(Price price, int factor);
 
 extern const ScoreInfo _score_info[];
-extern int _score_part[MAX_COMPANIES][SCORE_END];
+extern int64 _score_part[MAX_COMPANIES][SCORE_END];
 extern Economy _economy;
 /* Prices and also the fractional part. */
 extern Prices _price;