diff --git a/Mac/Include/macdefs.h b/Mac/Include/macdefs.h
index b89000460af..0a4a6f750a4 100644
--- a/Mac/Include/macdefs.h
+++ b/Mac/Include/macdefs.h
@@ -21,9 +21,6 @@
 /* We may be able to use a std routine in think, don't know */
 unsigned char *Pstring(char *);
 
-/* Macro to find out whether we can do HFS-only calls: */
-#define FSFCBLen (* (short *) 0x3f6)
-#define hfsrunning() (FSFCBLen > 0)
 
 /* Universal constants: */
 #define MAXPATH 256