diff --git a/src/newgrf.h b/src/newgrf.h
--- a/src/newgrf.h
+++ b/src/newgrf.h
@@ -5,6 +5,7 @@
 
 #include "station.h"
 #include "newgrf_config.h"
+#include "helpers.hpp"
 
 typedef enum GrfLoadingStage {
 	GLS_FILESCAN,
@@ -15,6 +16,9 @@ typedef enum GrfLoadingStage {
 	GLS_END,
 } GrfLoadingStage;
 
+DECLARE_POSTFIX_INCREMENT(GrfLoadingStage);
+
+
 typedef struct GRFLabel {
 	byte label;
 	uint32 nfo_line;