diff --git a/classlib/src/main/java/org/teavm/classlib/java/lang/TThreadLocal.java b/classlib/src/main/java/org/teavm/classlib/java/lang/TThreadLocal.java
index ec9a3a080..061f987a6 100644
--- a/classlib/src/main/java/org/teavm/classlib/java/lang/TThreadLocal.java
+++ b/classlib/src/main/java/org/teavm/classlib/java/lang/TThreadLocal.java
@@ -15,11 +15,6 @@
  */
 package org.teavm.classlib.java.lang;
 
-/**
- *
- * @author Alexey Andreev
- * @param <T> type of a value stored by thread local.
- */
 public class TThreadLocal<T> extends TObject {
     private boolean initialized;
     private T value;
@@ -41,6 +36,7 @@ public class TThreadLocal<T> extends TObject {
     }
 
     public void set(T value) {
+        initialized = true;
         this.value = value;
     }