diff --git a/internal/wire/stop_sending_frame.go b/internal/wire/stop_sending_frame.go
index f9a5d60b0..f710bdd3c 100644
--- a/internal/wire/stop_sending_frame.go
+++ b/internal/wire/stop_sending_frame.go
@@ -23,7 +23,7 @@ func parseStopSendingFrame(r *bytes.Reader, _ protocol.VersionNumber) (*StopSend
 	if err != nil {
 		return nil, err
 	}
-	errorCode, err := utils.BigEndian.ReadUint16(r)
+	errorCode, err := utils.ReadVarInt(r)
 	if err != nil {
 		return nil, err
 	}
@@ -36,12 +36,12 @@ func parseStopSendingFrame(r *bytes.Reader, _ protocol.VersionNumber) (*StopSend
 
 // Length of a written frame
 func (f *StopSendingFrame) Length(_ protocol.VersionNumber) protocol.ByteCount {
-	return 1 + utils.VarIntLen(uint64(f.StreamID)) + 2
+	return 1 + utils.VarIntLen(uint64(f.StreamID)) + utils.VarIntLen(uint64(f.ErrorCode))
 }
 
 func (f *StopSendingFrame) Write(b *bytes.Buffer, _ protocol.VersionNumber) error {
 	b.WriteByte(0x5)
 	utils.WriteVarInt(b, uint64(f.StreamID))
-	utils.BigEndian.WriteUint16(b, uint16(f.ErrorCode))
+	utils.WriteVarInt(b, uint64(f.ErrorCode))
 	return nil
 }
diff --git a/internal/wire/stop_sending_frame_test.go b/internal/wire/stop_sending_frame_test.go
index 746a060be..95cc4eb9c 100644
--- a/internal/wire/stop_sending_frame_test.go
+++ b/internal/wire/stop_sending_frame_test.go
@@ -15,7 +15,7 @@ var _ = Describe("STOP_SENDING frame", func() {
 		It("parses a sample frame", func() {
 			data := []byte{0x5}
 			data = append(data, encodeVarInt(0xdecafbad)...) // stream ID
-			data = append(data, []byte{0x13, 0x37}...)       // error code
+			data = append(data, encodeVarInt(0x1337)...)     // error code
 			b := bytes.NewReader(data)
 			frame, err := parseStopSendingFrame(b, versionIETFFrames)
 			Expect(err).ToNot(HaveOccurred())
@@ -27,7 +27,7 @@ var _ = Describe("STOP_SENDING frame", func() {
 		It("errors on EOFs", func() {
 			data := []byte{0x5}
 			data = append(data, encodeVarInt(0xdecafbad)...) // stream ID
-			data = append(data, []byte{0x13, 0x37}...)       // error code
+			data = append(data, encodeVarInt(0x123456)...)   // error code
 			_, err := parseStopSendingFrame(bytes.NewReader(data), versionIETFFrames)
 			Expect(err).NotTo(HaveOccurred())
 			for i := range data {
@@ -41,23 +41,22 @@ var _ = Describe("STOP_SENDING frame", func() {
 		It("writes", func() {
 			frame := &StopSendingFrame{
 				StreamID:  0xdeadbeefcafe,
-				ErrorCode: 0x10,
+				ErrorCode: 0xdecafbad,
 			}
 			buf := &bytes.Buffer{}
-			err := frame.Write(buf, versionIETFFrames)
-			Expect(err).ToNot(HaveOccurred())
+			Expect(frame.Write(buf, versionIETFFrames)).To(Succeed())
 			expected := []byte{0x5}
 			expected = append(expected, encodeVarInt(0xdeadbeefcafe)...)
-			expected = append(expected, []byte{0x0, 0x10}...)
+			expected = append(expected, encodeVarInt(0xdecafbad)...)
 			Expect(buf.Bytes()).To(Equal(expected))
 		})
 
 		It("has the correct min length", func() {
 			frame := &StopSendingFrame{
 				StreamID:  0xdeadbeef,
-				ErrorCode: 0x10,
+				ErrorCode: 0x1234567,
 			}
-			Expect(frame.Length(versionIETFFrames)).To(Equal(1 + 2 + utils.VarIntLen(0xdeadbeef)))
+			Expect(frame.Length(versionIETFFrames)).To(Equal(1 + utils.VarIntLen(0xdeadbeef) + utils.VarIntLen(0x1234567)))
 		})
 	})
 })