diff --git a/cmd/tsconnect/wasm/taildrop.go b/cmd/tsconnect/wasm/taildrop.go
index 60f2081c7..8115f1723 100644
--- a/cmd/tsconnect/wasm/taildrop.go
+++ b/cmd/tsconnect/wasm/taildrop.go
@@ -166,10 +166,15 @@ func (i *jsIPN) waitingFiles() js.Value {
 		if err != nil {
 			return nil, err
 		}
-		if wfs == nil {
-			wfs = []apitype.WaitingFile{}
+		type jsWaitingFile struct {
+			Name string `json:"name"`
+			Size int64  `json:"size"`
 		}
-		b, err := json.Marshal(wfs)
+		out := make([]jsWaitingFile, len(wfs))
+		for i, wf := range wfs {
+			out[i] = jsWaitingFile{Name: wf.Name, Size: wf.Size}
+		}
+		b, err := json.Marshal(out)
 		if err != nil {
 			return nil, err
 		}