diff --git a/report/id_list.go b/report/id_list.go
index 9d89d7d08..29d8b4f48 100644
--- a/report/id_list.go
+++ b/report/id_list.go
@@ -8,6 +8,12 @@ type IDList []string
 // MakeIDList makes a new IDList.
 func MakeIDList(ids ...string) IDList {
 	sort.Strings(ids)
+	for i := 1; i < len(ids); i++ { // shuffle down any duplicates
+		if ids[i-1] == ids[i] {
+			ids = append(ids[:i-1], ids[i:]...)
+			i--
+		}
+	}
 	return IDList(ids)
 }