diff --git a/backend/union/policy/newest.go b/backend/union/policy/newest.go
index b380eaad4..c8fd4f47a 100644
--- a/backend/union/policy/newest.go
+++ b/backend/union/policy/newest.go
@@ -52,7 +52,8 @@ func (p *Newest) newest(ctx context.Context, upstreams []*upstream.Fs, path stri
 func (p *Newest) newestEntries(entries []upstream.Entry) (upstream.Entry, error) {
 	var wg sync.WaitGroup
 	mtimes := make([]time.Time, len(entries))
-	ctx, _ := context.WithTimeout(context.Background(), 5*time.Second)
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
 	for i, e := range entries {
 		wg.Add(1)
 		i, e := i, e // Closure
diff --git a/backend/union/upstream/upstream.go b/backend/union/upstream/upstream.go
index ada593179..39581c3e7 100644
--- a/backend/union/upstream/upstream.go
+++ b/backend/union/upstream/upstream.go
@@ -307,7 +307,8 @@ func (f *Fs) updateUsageCore(lock bool) error {
 		defer f.cacheMutex.Unlock()
 	}
 	// Run in background, should not be cancelled by user
-	ctx, _ := context.WithTimeout(context.Background(), 15*time.Second)
+	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	defer cancel()
 	usage, err := f.Features().About(ctx)
 	if err != nil {
 		return err