diff --git a/lib/isccfg/parser.c b/lib/isccfg/parser.c
index 4ea849e64f..d27e6e599a 100644
--- a/lib/isccfg/parser.c
+++ b/lib/isccfg/parser.c
@@ -1034,7 +1034,7 @@ cfg_print_duration(cfg_printer_t *pctx, const cfg_obj_t *obj) {
 	char *str;
 	const char *indicators = "YMWDHMS";
 	int count, i;
-	int durationlen[7];
+	int durationlen[7] = { 0 };
 	isccfg_duration_t duration;
 	/*
 	 * D ? The duration has a date part.
@@ -1066,10 +1066,8 @@ cfg_print_duration(cfg_printer_t *pctx, const cfg_obj_t *obj) {
 			} else {
 				T = true;
 			}
-		} else {
-			durationlen[i] = 0;
+			count += durationlen[i];
 		}
-		count += durationlen[i];
 	}
 	/*
 	 * Special case for seconds which is not taken into account in the
@@ -1107,7 +1105,7 @@ cfg_print_duration(cfg_printer_t *pctx, const cfg_obj_t *obj) {
 	}
 	/* Special case for seconds. */
 	if (duration.parts[6] > 0 ||
-	    (!D && !duration.parts[4] && !duration.parts[3])) {
+	    (!D && !duration.parts[4] && !duration.parts[5])) {
 		snprintf(str, durationlen[6] + 2, "%u%c",
 			 (uint32_t)duration.parts[6], indicators[6]);
 	}