diff --git a/all.h b/all.h
index b60709b..6b75b2c 100644
--- a/all.h
+++ b/all.h
@@ -672,6 +672,7 @@ global const u8  MAX_u8  = 0xff;
 #ifndef SECONDS_PER_MINUTE
 #  define SECONDS_PER_MINUTE (60.0)
 #endif
+#define YARDS_PER_MILE (1760.0)
 
 
 ///// CUSTOM ENTRY POINT