diff --git a/lib/isc/include/isc/result.h b/lib/isc/include/isc/result.h
index 483e543e36..c923cd2886 100644
--- a/lib/isc/include/isc/result.h
+++ b/lib/isc/include/isc/result.h
@@ -41,12 +41,12 @@ ISC_LANG_BEGINDECLS
 #define ISC_R_NORESOURCES		13	/* not enough resources */
 #define ISC_R_EOF			14	/* end of file */
 #define ISC_R_BOUND			15	/* already bound */
-#define ISC_R_TASKDONE			16	/* task is done */
+/* AVAILABLE CODE			16 */
 #define ISC_R_LOCKBUSY			17
 #define ISC_R_EXISTS			18
 #define ISC_R_NOSPACE			19	/* ran out of space */
 #define ISC_R_CANCELED			20
-#define ISC_R_TASKNOSEND		21
+/* AVAILABLE CODE			21 */
 #define ISC_R_SHUTTINGDOWN		22	/* shutting down */
 #define ISC_R_NOTFOUND			23
 #define ISC_R_UNEXPECTEDEND		24	/* unexpected end of input */
diff --git a/lib/isc/result.c b/lib/isc/result.c
index 5e439e499d..8dedab78f7 100644
--- a/lib/isc/result.c
+++ b/lib/isc/result.c
@@ -57,12 +57,12 @@ static char *text[ISC_R_NRESULTS] = {
 	"not enough free resources",		/* 13 */
 	"end of file",				/* 14 */
 	"socket already bound",			/* 15 */
-	"task is done",				/* 16 */
+	"<available code 16>",			/* 16 */
 	"lock busy",				/* 17 */
 	"already exists",			/* 18 */
 	"ran out of space",			/* 19 */
 	"operation canceled",			/* 20 */
-	"sending events is not allowed",	/* 21 */
+	"<available code 21>",			/* 21 */
 	"shutting down",			/* 22 */
 	"not found",				/* 23 */
 	"unexpected end of input",		/* 24 */