diff --git a/lib/isc/include/isc/result.h b/lib/isc/include/isc/result.h
index 642fdf777b..1f5e4c155f 100644
--- a/lib/isc/include/isc/result.h
+++ b/lib/isc/include/isc/result.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 1998  Internet Software Consortium.
+ * Copyright (C) 1998, 1999  Internet Software Consortium.
  * 
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -47,7 +47,8 @@ typedef unsigned int isc_result_t;
 #define ISC_R_UNEXPECTEDEND		24	/* unexpected end of input */
 #define ISC_R_FAILURE			25	/* generic failure */
 #define ISC_R_IOERROR			26
-#define ISC_R_LASTENTRY			26	/* last entry in the list */
+#define ISC_R_NOTIMPLEMENTED		27
+#define ISC_R_LASTENTRY			27	/* last entry in the list */
 
 #define ISC_R_UNEXPECTED		0xFFFFFFFFL
 
diff --git a/lib/isc/result.c b/lib/isc/result.c
index 426192f8cb..8a9460b468 100644
--- a/lib/isc/result.c
+++ b/lib/isc/result.c
@@ -47,6 +47,7 @@ static char *text_table[ISC_R_LASTENTRY + 1] = {
 	"unexpected end of input",		/* 24 */
 	"failure",				/* 25 */
 	"I/O error",				/* 26 */
+	"not implemented",			/* 27 */
 };
 
 char *