--- a/rail.h	Sat Mar 18 15:29:24 2006 +0000
+++ b/rail.h	Sat Mar 18 15:31:34 2006 +0000
@@ -552,7 +552,7 @@
 static inline bool HasSemaphores(TileIndex tile, Track track)
 {
 	assert(IsValidTrack(track));
-	return (_m[tile].m4 & SIG_SEMAPHORE_MASK);
+	return (_m[tile].m4 & SIG_SEMAPHORE_MASK) != 0;
 }
 
 /**