diff --git a/src/include/blf.h b/src/include/blf.h
index 6c9085a6..ec42b419 100644
--- a/src/include/blf.h
+++ b/src/include/blf.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: blf.h,v 1.6 2002/02/16 21:27:17 millert Exp $ */
+/* $OpenBSD: blf.h,v 1.7 2007/03/14 17:59:41 grunk Exp $ */
 /*
  * Blowfish - a fast block cipher designed by Bruce Schneier
  *
@@ -43,6 +43,7 @@
 
 #define BLF_N	16			/* Number of Subkeys */
 #define BLF_MAXKEYLEN ((BLF_N-2)*4)	/* 448 bits */
+#define BLF_MAXUTILIZED ((BLF_N+2)*4)	/* 576 bits */
 
 /* Blowfish context */
 typedef struct BlowfishContext {