diff --git a/src/newgrf.h b/src/newgrf.h
--- a/src/newgrf.h
+++ b/src/newgrf.h
@@ -85,7 +85,6 @@ struct GRFFile {
 
 extern GRFFile *_first_grffile;
 
-extern SpriteID _signal_base;
 extern SpriteID _coast_base;
 
 struct GRFLoadedFeatures {