diff --git a/oxm-tiger/src/main/java/org/springframework/oxm/jaxb/Jaxb2Marshaller.java b/oxm-tiger/src/main/java/org/springframework/oxm/jaxb/Jaxb2Marshaller.java
index 219248b2..325e7915 100644
--- a/oxm-tiger/src/main/java/org/springframework/oxm/jaxb/Jaxb2Marshaller.java
+++ b/oxm-tiger/src/main/java/org/springframework/oxm/jaxb/Jaxb2Marshaller.java
@@ -93,7 +93,7 @@ public class Jaxb2Marshaller extends AbstractJaxbMarshaller implements MimeMarsh
 
     private Map<java.lang.String, ?> jaxbContextProperties;
 
-    private boolean mtomEnabled = true;
+    private boolean mtomEnabled = false;
 
     /**
      * Sets the <code>XmlAdapter</code>s to be registered with the JAXB <code>Marshaller</code> and
@@ -127,8 +127,8 @@ public class Jaxb2Marshaller extends AbstractJaxbMarshaller implements MimeMarsh
     }
 
     /**
-     * Indicates whether MTOM support should be enabled or not. Default is <code>true</code>, marshalling using XOP/MTOM
-     * is enabled.
+     * Indicates whether MTOM support should be enabled or not. Default is <code>false</code>, marshalling using
+     * XOP/MTOM is not enabled.
      */
     public void setMtomEnabled(boolean mtomEnabled) {
         this.mtomEnabled = mtomEnabled;
diff --git a/oxm-tiger/src/test/java/org/springframework/oxm/jaxb/Jaxb2MarshallerTest.java b/oxm-tiger/src/test/java/org/springframework/oxm/jaxb/Jaxb2MarshallerTest.java
index 2d2e0a21..49d3e384 100644
--- a/oxm-tiger/src/test/java/org/springframework/oxm/jaxb/Jaxb2MarshallerTest.java
+++ b/oxm-tiger/src/test/java/org/springframework/oxm/jaxb/Jaxb2MarshallerTest.java
@@ -199,6 +199,7 @@ public class Jaxb2MarshallerTest extends XMLTestCase {
     public void testMarshalAttachments() throws Exception {
         marshaller = new Jaxb2Marshaller();
         marshaller.setClassesToBeBound(new Class[]{BinaryObject.class});
+        marshaller.setMtomEnabled(true);
         marshaller.afterPropertiesSet();
         MimeContainer mimeContainer = createMock(MimeContainer.class);
 
diff --git a/oxm-tiger/src/test/java/org/springframework/oxm/jaxb/Jaxb2UnmarshallerTest.java b/oxm-tiger/src/test/java/org/springframework/oxm/jaxb/Jaxb2UnmarshallerTest.java
index 62394311..dca8661a 100644
--- a/oxm-tiger/src/test/java/org/springframework/oxm/jaxb/Jaxb2UnmarshallerTest.java
+++ b/oxm-tiger/src/test/java/org/springframework/oxm/jaxb/Jaxb2UnmarshallerTest.java
@@ -114,6 +114,7 @@ public class Jaxb2UnmarshallerTest extends TestCase {
     public void testMarshalAttachments() throws Exception {
         unmarshaller = new Jaxb2Marshaller();
         unmarshaller.setClassesToBeBound(new Class[]{BinaryObject.class});
+        unmarshaller.setMtomEnabled(true);
         unmarshaller.afterPropertiesSet();
         MimeContainer mimeContainer = createMock(MimeContainer.class);