diff --git a/src/com/google/javascript/jscomp/Tracer.java b/src/com/google/javascript/jscomp/Tracer.java
index <HASH>..<HASH> 100644
--- a/src/com/google/javascript/jscomp/Tracer.java
+++ b/src/com/google/javascript/jscomp/Tracer.java
@@ -967,7 +967,7 @@ final class Tracer {
 
   /** Remove any ThreadTrace associated with the current thread */
   static void clearThreadTrace() {
-    traces.set(null);
+    traces.remove();
   }
 
   /**
Remove Tracer thread local storage when cleaning up.
fixes issue <I>

R=acleung,nicksantos
DELTA=1  (0 added, 0 deleted, 1 changed)


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