diff --git a/lib/isc/include/isc/result.h b/lib/isc/include/isc/result.h
index b3c2c6109f..1ef2a642f8 100644
--- a/lib/isc/include/isc/result.h
+++ b/lib/isc/include/isc/result.h
@@ -60,8 +60,9 @@ ISC_LANG_BEGINDECLS
 #define ISC_R_UNEXPECTEDTOKEN		32
 #define ISC_R_QUOTA			33
 #define ISC_R_UNEXPECTED		34
+#define ISC_R_ALREADYRUNNING		35
 
-#define ISC_R_NRESULTS 			35	/* Number of results */
+#define ISC_R_NRESULTS 			36	/* Number of results */
 
 char *			isc_result_totext(isc_result_t);
 isc_result_t		isc_result_register(unsigned int base,
diff --git a/lib/isc/result.c b/lib/isc/result.c
index da5c9eae26..f02ae3047d 100644
--- a/lib/isc/result.c
+++ b/lib/isc/result.c
@@ -76,6 +76,7 @@ static char *text[ISC_R_NRESULTS] = {
 	"unexpected token",			/* 32 */
 	"quota reached",			/* 33 */
 	"unexpected error",			/* 34 */
+	"already running",			/* 35 */
 };
 
 #define ISC_RESULT_RESULTSET			2