diff --git a/src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/LegacyXmlResultFormatter.java b/src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/LegacyXmlResultFormatter.java
index 6ea6e7b04..bf42199e8 100644
--- a/src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/LegacyXmlResultFormatter.java
+++ b/src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/LegacyXmlResultFormatter.java
@@ -302,6 +302,8 @@ class LegacyXmlResultFormatter extends AbstractJUnitResultFormatter implements T
                     writer.writeAttribute(ATTR_MESSAGE, message);
                 }
                 writer.writeAttribute(ATTR_TYPE, t.getClass().getName());
+                // write out the stacktrace
+                writer.writeCData(StringUtils.getStackTrace(cause.get()));
             }
             writer.writeEndElement();
         }