diff --git a/src/main/org/apache/tools/ant/taskdefs/optional/junit/JUnitTask.java b/src/main/org/apache/tools/ant/taskdefs/optional/junit/JUnitTask.java
index 9d57b672c..d4e8d76fc 100644
--- a/src/main/org/apache/tools/ant/taskdefs/optional/junit/JUnitTask.java
+++ b/src/main/org/apache/tools/ant/taskdefs/optional/junit/JUnitTask.java
@@ -618,6 +618,7 @@ public class JUnitTask extends Task {
     public void init() {
         antRuntimeClasses = new Path(getProject());
         addClasspathEntry("/junit/framework/TestCase.class");
+        addClasspathEntry("/org/apache/tools/ant/launch/AntMain.class");
         addClasspathEntry("/org/apache/tools/ant/Task.class");
         addClasspathEntry("/org/apache/tools/ant/taskdefs/optional/junit/JUnitTestRunner.class");
     }