diff --git a/WHATSNEW b/WHATSNEW
index f763f6177..e20e2a8a1 100644
--- a/WHATSNEW
+++ b/WHATSNEW
@@ -242,6 +242,9 @@ Fixed bugs:
 * The socket condition will now close the socket created to test.
   Bugzilla Report 23040.
 
+* <junit includeantruntime="true" fork="true"> replaced the CLASSPATH instead
+  of adding to it.  Bugzilla Report 14971.
+
 Other changes:
 --------------
 * All tasks can be used outside of <target>s.  Note that some tasks
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 b64a1eb3d..8ac01009c 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
@@ -717,6 +717,17 @@ public class JUnitTask extends Task {
         cmd.createArgument().setValue("haltOnFailure="
                                       + test.getHaltonfailure());
         if (includeAntRuntime) {
+            Vector v = Execute.getProcEnvironment();
+            Enumeration e = v.elements();
+            while (e.hasMoreElements()) {
+                String s = (String) e.nextElement();
+                if (s.startsWith("CLASSPATH=")) {
+                    cmd.createClasspath(getProject()).createPath()
+                        .append(new Path(getProject(), 
+                                         s.substring(10 // "CLASSPATH=".length()
+                                                     )));
+                }
+            }
             log("Implicitly adding " + antRuntimeClasses + " to CLASSPATH",
                 Project.MSG_VERBOSE);
             cmd.createClasspath(getProject()).createPath()