diff --git a/src/pkg/encoding/xml/marshal.go b/src/pkg/encoding/xml/marshal.go
index 4ef2a50eaca1e..7a05a1bb10e71 100644
--- a/src/pkg/encoding/xml/marshal.go
+++ b/src/pkg/encoding/xml/marshal.go
@@ -21,16 +21,8 @@ const (
 	Header = `<?xml version="1.0" encoding="UTF-8"?>` + "\n"
 )
 
-// A Marshaler can produce well-formatted XML representing its internal state.
-type Marshaler interface {
-	MarshalXML() ([]byte, error)
-}
-
 // Marshal returns the XML encoding of v.
 //
-// If v implements Marshaler, then Marshal calls its MarshalXML method.
-// Otherwise, Marshal uses the following procedure to create the XML.
-//
 // Marshal handles an array or slice by marshalling each of the elements.
 // Marshal handles a pointer by marshalling the value it points at or, if the
 // pointer is nil, by writing nothing.  Marshal handles an interface value by
@@ -128,18 +120,6 @@ func (p *printer) marshalValue(val reflect.Value, finfo *fieldInfo) error {
 	kind := val.Kind()
 	typ := val.Type()
 
-	// Try Marshaler
-	if typ.NumMethod() > 0 {
-		if marshaler, ok := val.Interface().(Marshaler); ok {
-			bytes, err := marshaler.MarshalXML()
-			if err != nil {
-				return err
-			}
-			p.Write(bytes)
-			return nil
-		}
-	}
-
 	// Drill into pointers/interfaces
 	if kind == reflect.Ptr || kind == reflect.Interface {
 		if val.IsNil() {
diff --git a/src/pkg/encoding/xml/marshal_test.go b/src/pkg/encoding/xml/marshal_test.go
index 3bdfa55c80bbf..e0be33200864e 100644
--- a/src/pkg/encoding/xml/marshal_test.go
+++ b/src/pkg/encoding/xml/marshal_test.go
@@ -34,12 +34,6 @@ type Ship struct {
 	secret    string
 }
 
-type RawXML string
-
-func (rx RawXML) MarshalXML() ([]byte, error) {
-	return []byte(rx), nil
-}
-
 type NamedType string
 
 type Port struct {
@@ -298,13 +292,6 @@ var marshalTests = []struct {
 		UnmarshalOnly: true,
 	},
 
-	// Test marshaller interface
-	{
-		Value:       RawXML("</>"),
-		ExpectXML:   `</>`,
-		MarshalOnly: true,
-	},
-
 	// Test structs
 	{Value: &Port{Type: "ssl", Number: "443"}, ExpectXML: `<port type="ssl">443</port>`},
 	{Value: &Port{Number: "443"}, ExpectXML: `<port>443</port>`},