--- a/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/DefaultCallTarget.java	Thu Sep 18 12:28:11 2014 +0200
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/DefaultCallTarget.java	Wed Sep 17 20:57:20 2014 +0200
@@ -35,13 +35,11 @@
 public class DefaultCallTarget implements RootCallTarget {
 
     private final RootNode rootNode;
-    private final DefaultTruffleRuntime defaultTruffleRuntime;
 
-    public DefaultCallTarget(RootNode function, DefaultTruffleRuntime defaultTruffleRuntime) {
+    public DefaultCallTarget(RootNode function) {
         this.rootNode = function;
         this.rootNode.adoptChildren();
         this.rootNode.setCallTarget(this);
-        this.defaultTruffleRuntime = defaultTruffleRuntime;
     }
 
     @Override
@@ -56,7 +54,7 @@
     @Override
     public Object call(Object... args) {
         final VirtualFrame frame = new DefaultVirtualFrame(getRootNode().getFrameDescriptor(), args);
-        FrameInstance oldCurrentFrame = defaultTruffleRuntime.setCurrentFrame(new FrameInstance() {
+        FrameInstance oldCurrentFrame = defaultTruffleRuntime().setCurrentFrame(new FrameInstance() {
 
             public Frame getFrame(FrameAccess access, boolean slowPath) {
                 return frame;
@@ -77,7 +75,11 @@
         try {
             return getRootNode().execute(frame);
         } finally {
-            defaultTruffleRuntime.setCurrentFrame(oldCurrentFrame);
+            defaultTruffleRuntime().setCurrentFrame(oldCurrentFrame);
         }
     }
+
+    private static DefaultTruffleRuntime defaultTruffleRuntime() {
+        return (DefaultTruffleRuntime) Truffle.getRuntime();
+    }
 }