diff --git a/src/main/org/apache/tools/ant/RuntimeConfigurable.java b/src/main/org/apache/tools/ant/RuntimeConfigurable.java
index f782315a0..19a69a6dd 100644
--- a/src/main/org/apache/tools/ant/RuntimeConfigurable.java
+++ b/src/main/org/apache/tools/ant/RuntimeConfigurable.java
@@ -348,26 +348,16 @@ public class RuntimeConfigurable implements Serializable {
                 childTask.setRuntimeConfigurableWrapper(child);
             }
 
-            if (configureChildren) {
-                /*
-                 * backwards compatibility - element names of nested
-                 * elements have been all lower-case in Ant, except for
-                 * TaskContainers
-                 */
-
-                /* XXX
-                 *
-                 * For some reason we don't throw an exception here if
-                 * we find the nested element is unsupported, probably
-                 * because this will happen somewhere else.
-                 */
-                String tag = child.getElementTag();
-                if (ih.supportsNestedElement(tag.toLowerCase(Locale.US))) {
-                    tag = tag.toLowerCase(Locale.US);
-                } else if (!ih.supportsNestedElement(tag)) {
-                    continue;
-                }
-                
+            /*
+             * backwards compatibility - element names of nested
+             * elements have been all lower-case in Ant, except for
+             * tasks in TaskContainers.
+             *
+             * For TaskContainers, we simply skip configuration here.
+             */
+            String tag = child.getElementTag().toLowerCase(Locale.US);
+            if (configureChildren
+                && ih.supportsNestedElement(tag)) {
                 child.maybeConfigure(p);
                 ProjectHelper.storeChild(p, target, child.wrappedObject,
                                          tag);
diff --git a/src/main/org/apache/tools/ant/UnknownElement.java b/src/main/org/apache/tools/ant/UnknownElement.java
index c183637e3..5f0d4dd3d 100644
--- a/src/main/org/apache/tools/ant/UnknownElement.java
+++ b/src/main/org/apache/tools/ant/UnknownElement.java
@@ -273,15 +273,16 @@ public class UnknownElement extends Task {
             RuntimeConfigurable childWrapper = parentWrapper.getChild(i);
             UnknownElement child = (UnknownElement) children.elementAt(i);
             Object realChild = null;
-
-            if (handleChild(ih, parent, child, 
-                            child.getTag().toLowerCase(Locale.US), 
-                            childWrapper)) {
-            } else if (!(parent instanceof TaskContainer)) {
-                ih.throwNotSupported(getProject(), parent, child.getTag());
-            } else {
-                if (!handleChild(ih, parent, child, child.getTag(), 
-                                 childWrapper)) {
+            
+            // backwards compatibility - element names of nested
+            // elements have been all lower-case in Ant, except for
+            // TaskContainers
+            if (!handleChild(ih, parent, child, 
+                             child.getTag().toLowerCase(Locale.US), 
+                             childWrapper)) {
+                if (!(parent instanceof TaskContainer)) {
+                    ih.throwNotSupported(getProject(), parent, child.getTag());
+                } else {
                     // a task container - anything could happen - just add the 
                     // child to the container
                     TaskContainer container = (TaskContainer) parent;