diff --git a/src/imsrc/maze.3 b/src/imsrc/maze.3
index 4b598394..f38d92d2 100644
--- a/src/imsrc/maze.3
+++ b/src/imsrc/maze.3
@@ -2524,7 +2524,8 @@ ININFO:	0			; input information from 10 buffer
 
 	CONSTANTS
 
-;loc 14000		;happens about here anyway, just needs precision.
+;       constants and WALLS must be below 14000
+IFGE .-14000, .ERR Code overflows 2k boundary.
 
 ;
 ;	distances to walls table