diff --git a/src/restic/repository/prune.go b/src/restic/repository/prune.go
index 61f4d1afd..db874a0b7 100644
--- a/src/restic/repository/prune.go
+++ b/src/restic/repository/prune.go
@@ -41,6 +41,8 @@ func Repack(repo *Repository, packs, keepBlobs backend.IDSet) error {
 			}
 
 			debug.Log("Repack", "  saved blob %v", blob.ID.Str())
+
+			keepBlobs.Delete(blob.ID)
 		}
 	}
 
diff --git a/src/restic/repository/prune_test.go b/src/restic/repository/prune_test.go
index fc4099ff7..accd88f14 100644
--- a/src/restic/repository/prune_test.go
+++ b/src/restic/repository/prune_test.go
@@ -158,14 +158,14 @@ func TestRepack(t *testing.T) {
 
 	removeBlobs, keepBlobs := selectBlobs(t, repo, 0.2)
 
-	packs := findPacksForBlobs(t, repo, keepBlobs)
+	removePacks := findPacksForBlobs(t, repo, removeBlobs)
 
-	repack(t, repo, packs, keepBlobs)
+	repack(t, repo, removePacks, keepBlobs)
 	rebuildIndex(t, repo)
 	reloadIndex(t, repo)
 
 	packsAfter = listPacks(t, repo)
-	for id := range packs {
+	for id := range removePacks {
 		if packsAfter.Has(id) {
 			t.Errorf("pack %v still present although it should have been repacked and removed", id.Str())
 		}
@@ -178,7 +178,7 @@ func TestRepack(t *testing.T) {
 			t.Errorf("unable to find blob %v in repo", id.Str())
 		}
 
-		if packs.Has(pb.PackID) {
+		if removePacks.Has(pb.PackID) {
 			t.Errorf("lookup returned pack ID %v that should've been removed", pb.PackID)
 		}
 	}