diff --git a/lib/isc/include/isc/result.h b/lib/isc/include/isc/result.h
index 872aee3f35..fa22965831 100644
--- a/lib/isc/include/isc/result.h
+++ b/lib/isc/include/isc/result.h
@@ -43,7 +43,8 @@ typedef unsigned int isc_result_t;
 #define ISC_R_CANCELED			20
 #define ISC_R_TASKNOSEND		21
 #define ISC_R_TASKSHUTTINGDOWN		22	/* task is shutting down */
-#define ISC_R_LASTENTRY			22	/* last entry in the list */
+#define ISC_R_NOTFOUND			23
+#define ISC_R_LASTENTRY			23	/* last entry in the list */
 
 #define ISC_R_UNEXPECTED		0xFFFFFFFFL
 
diff --git a/lib/isc/result.c b/lib/isc/result.c
index 8afd5c75d9..b529ba9f60 100644
--- a/lib/isc/result.c
+++ b/lib/isc/result.c
@@ -43,6 +43,7 @@ static char *text_table[ISC_R_LASTENTRY + 1] = {
 	"operation canceled",			/* 20 */
 	"sending events is not allowed",	/* 21 */
 	"task is shutting down",		/* 22 */
+	"Not found",				/* 23 */
 };
 
 char *