diff --git a/p2p/transport/webrtc/listener.go b/p2p/transport/webrtc/listener.go
index db7b7661f3..ea10b618ef 100644
--- a/p2p/transport/webrtc/listener.go
+++ b/p2p/transport/webrtc/listener.go
@@ -215,7 +215,12 @@ func (l *listener) accept(ctx context.Context, addr candidateAddr) (tpt.CapableC
 		defer cleanup()
 		return nil, err
 	}
-	pc.SetLocalDescription(answer)
+
+	err = pc.SetLocalDescription(answer)
+	if err != nil {
+		defer cleanup()
+		return nil, err
+	}
 
 	// await peerconnection connected state
 	select {
diff --git a/p2p/transport/webrtc/udp_mux.go b/p2p/transport/webrtc/udp_mux.go
index c9075a53be..03b41c8a0d 100644
--- a/p2p/transport/webrtc/udp_mux.go
+++ b/p2p/transport/webrtc/udp_mux.go
@@ -48,7 +48,7 @@ type udpMuxNewAddr struct {
 }
 
 const maxAddrSize = 512
-const receiveMTU = 8192
+const receiveMTU = 1500
 
 // NewUDPMuxNewAddr creates an implementation of UDPMux
 func NewUDPMuxNewAddr(params ice.UDPMuxParams, newAddrChan chan candidateAddr) *udpMuxNewAddr {