diff --git a/tests/src/test/java/org/teavm/classlib/java/lang/ThreadTest.java b/tests/src/test/java/org/teavm/classlib/java/lang/ThreadTest.java
index 477ee0a03..ae7b4ff41 100644
--- a/tests/src/test/java/org/teavm/classlib/java/lang/ThreadTest.java
+++ b/tests/src/test/java/org/teavm/classlib/java/lang/ThreadTest.java
@@ -39,23 +39,21 @@ public class ThreadTest {
     public void sleepInterrupted() {
         long start = System.currentTimeMillis();
         final Thread mainThread = Thread.currentThread();
-        new Thread() {
-            @Override public void run() {
-                try {
-                    Thread.sleep(50);
-                } catch (InterruptedException e) {
-                    // ok
-                }
-                mainThread.interrupt();
+        new Thread(() -> {
+            try {
+                Thread.sleep(50);
+            } catch (InterruptedException e) {
+                // ok
             }
-        }.start();
+            mainThread.interrupt();
+        }).start();
         try {
-            Thread.sleep(500);
+            Thread.sleep(5000);
             fail("Exception expected");
         } catch (InterruptedException e) {
             assertEquals(Thread.currentThread(), mainThread);
             assertFalse(mainThread.isInterrupted());
-            assertTrue(System.currentTimeMillis() - start < 150);
+            assertTrue(System.currentTimeMillis() - start < 500);
         }
     }