diff --git a/connection.go b/connection.go
index 9c8821d91ff..b922979644c 100644
--- a/connection.go
+++ b/connection.go
@@ -2358,9 +2358,10 @@ func (s *connection) SendDatagram(p []byte) error {
 	}
 
 	f := &wire.DatagramFrame{DataLenPresent: true}
-	if protocol.ByteCount(len(p)) > f.MaxDataLen(s.peerParams.MaxDatagramFrameSize, s.version) {
+	maxDataLen := f.MaxDataLen(s.peerParams.MaxDatagramFrameSize, s.version)
+	if protocol.ByteCount(len(p)) > maxDataLen {
 		return &DatagramTooLargeError{
-			PeerMaxDatagramFrameSize: int64(s.peerParams.MaxDatagramFrameSize),
+			PeerMaxDatagramFrameSize: int64(maxDataLen),
 		}
 	}
 	f.Data = make([]byte, len(p))
diff --git a/errors.go b/errors.go
index fda3c9247cc..a5fa87b1e6f 100644
--- a/errors.go
+++ b/errors.go
@@ -49,11 +49,6 @@ type StreamError struct {
 	Remote    bool
 }
 
-func (e *StreamError) Is(target error) bool {
-	_, ok := target.(*StreamError)
-	return ok
-}
-
 func (e *StreamError) Error() string {
 	pers := "local"
 	if e.Remote {
@@ -67,9 +62,4 @@ type DatagramTooLargeError struct {
 	PeerMaxDatagramFrameSize int64
 }
 
-func (e *DatagramTooLargeError) Is(target error) bool {
-	_, ok := target.(*DatagramTooLargeError)
-	return ok
-}
-
 func (e *DatagramTooLargeError) Error() string { return "DATAGRAM frame too large" }
diff --git a/integrationtests/self/cancelation_test.go b/integrationtests/self/cancelation_test.go
index 28f3e009a96..9027886ca4f 100644
--- a/integrationtests/self/cancelation_test.go
+++ b/integrationtests/self/cancelation_test.go
@@ -246,6 +246,7 @@ var _ = Describe("Stream Cancellations", func() {
 						Expect(err).To(MatchError(&quic.StreamError{
 							StreamID:  str.StreamID(),
 							ErrorCode: quic.StreamErrorCode(str.StreamID()),
+							Remote:    true,
 						}))
 						return
 					}
@@ -356,6 +357,7 @@ var _ = Describe("Stream Cancellations", func() {
 							Expect(err).To(MatchError(&quic.StreamError{
 								StreamID:  str.StreamID(),
 								ErrorCode: quic.StreamErrorCode(str.StreamID()),
+								Remote:    true,
 							}))
 							return
 						}
@@ -396,6 +398,7 @@ var _ = Describe("Stream Cancellations", func() {
 						Expect(err).To(MatchError(&quic.StreamError{
 							StreamID:  str.StreamID(),
 							ErrorCode: quic.StreamErrorCode(str.StreamID()),
+							Remote:    true,
 						}))
 						return
 					}
@@ -441,6 +444,7 @@ var _ = Describe("Stream Cancellations", func() {
 							Expect(err).To(MatchError(&quic.StreamError{
 								StreamID:  str.StreamID(),
 								ErrorCode: quic.StreamErrorCode(str.StreamID()),
+								Remote:    true,
 							}))
 							return
 						}
@@ -486,6 +490,7 @@ var _ = Describe("Stream Cancellations", func() {
 						Expect(err).To(MatchError(&quic.StreamError{
 							StreamID:  str.StreamID(),
 							ErrorCode: quic.StreamErrorCode(str.StreamID()),
+							Remote:    true,
 						}))
 						return
 					}