diff --git a/cli/internal/transport/transport.go b/cli/internal/transport/transport.go
index d5a12f3..b8f3c5e 100644
--- a/cli/internal/transport/transport.go
+++ b/cli/internal/transport/transport.go
@@ -758,11 +758,12 @@ func (s *Session) SendFile(path string) error {
 			return err
 		}
 	}
+	// §9: send file-done before closing the file DC so the control channel
+	// is still reachable when the message is delivered.
+	s.controlSend(map[string]string{"type": "file-done", "xid": xid, "sha256": sha256hex})
 	if err := dc.Close(); err != nil {
 		return err
 	}
-	// §9: send file-done with the pre-computed hash so the receiver can verify.
-	s.controlSend(map[string]string{"type": "file-done", "xid": xid, "sha256": sha256hex})
 	return nil
 }
 
diff --git a/pwa/src/transport/flit.ts b/pwa/src/transport/flit.ts
index fa5ba67..c39694f 100644
--- a/pwa/src/transport/flit.ts
+++ b/pwa/src/transport/flit.ts
@@ -510,9 +510,10 @@ export class PeerConn {
       this.events.fileSendProgress?.({ peer: this.peerId, xid, name: file.name, sent: resumeOffset + localOffset, total: file.size })
       await new Promise(r => setTimeout(r, 0))
     }
-    dc.close()
-    // §9: send file-done with sha256 so receiver can verify integrity.
+    // §9: send file-done before closing the file DC so the control channel
+    // is still healthy when the message is dispatched.
     this._dc({ type: 'file-done', xid, sha256: hash })
+    dc.close()
     this.events.fileSent?.({ peer: this.peerId, xid, name: file.name })
   }