diff --git a/src/industry_cmd.cpp b/src/industry_cmd.cpp
--- a/src/industry_cmd.cpp
+++ b/src/industry_cmd.cpp
@@ -2187,10 +2187,8 @@ static void ReportNewsProductionChangeIn
 	);
 }
 
-enum {
-	PERCENT_TRANSPORTED_60 = 153,
-	PERCENT_TRANSPORTED_80 = 204,
-};
+static const uint PERCENT_TRANSPORTED_60 = 153;
+static const uint PERCENT_TRANSPORTED_80 = 204;
 
 /** Change industry production or do closure
  * @param i Industry for which changes are performed