1 files changed, 2 insertions, 0 deletions
diff --git a/src/newgrf.h b/src/newgrf.h
index 172de0d5f..dc9e1e67d 100644
--- a/src/newgrf.h
+++ b/src/newgrf.h
@@ -50,6 +50,8 @@ enum GrfSpecFeature {
 	GSF_END,
 };
 
+static const uint32 INVALID_GRFID = 0xFFFFFFFF;
+
 struct GRFLabel {
 	byte label;
 	uint32 nfo_line;