diff --git a/dev/core/src/com/google/gwt/dev/js/JsConstructExpressionVisitor.java b/dev/core/src/com/google/gwt/dev/js/JsConstructExpressionVisitor.java
index a244456..3d09cba 100644
--- a/dev/core/src/com/google/gwt/dev/js/JsConstructExpressionVisitor.java
+++ b/dev/core/src/com/google/gwt/dev/js/JsConstructExpressionVisitor.java
@@ -108,8 +108,13 @@
    * We only look at nodes that would not normally be surrounded by parentheses.
    */
   protected <T extends JsVisitable<T>> T doAccept(T node) {
-    if (node instanceof JsExpression) {
-      JsExpression expression = (JsExpression) node;
+    /*
+     * Extra casts to Object to prevent 'inconvertible types' compile errors due
+     * to http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6548436
+     * reproducible in jdk1.6.0_02.
+     */
+    if ((Object) node instanceof JsExpression) {
+      JsExpression expression = (JsExpression) (Object) node;
       int precedence = JsPrecedenceVisitor.exec(expression);
       // Only visit expressions that won't automatically be surrounded by
       // parentheses