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 6072bbcdf..d2c62b990 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
@@ -51,9 +51,10 @@ public class ThreadTest {
             Thread.sleep(5000);
             fail("Exception expected");
         } catch (InterruptedException e) {
+            long end = System.currentTimeMillis();
             assertEquals(Thread.currentThread(), mainThread);
             assertFalse(mainThread.isInterrupted());
-            assertTrue(System.currentTimeMillis() - start < 500);
+            assertTrue("Wait time " + (end - start), end - start < 5000);
         }
     }
 
diff --git a/tests/src/test/java/org/teavm/classlib/java/util/concurrent/ArrayBlockingQueueTest.java b/tests/src/test/java/org/teavm/classlib/java/util/concurrent/ArrayBlockingQueueTest.java
index 2e5d14611..d6103dcf8 100644
--- a/tests/src/test/java/org/teavm/classlib/java/util/concurrent/ArrayBlockingQueueTest.java
+++ b/tests/src/test/java/org/teavm/classlib/java/util/concurrent/ArrayBlockingQueueTest.java
@@ -102,7 +102,7 @@ public class ArrayBlockingQueueTest {
         long start = System.currentTimeMillis();
         queue.put(3);
         long end = System.currentTimeMillis();
-        assertTrue("Wait time " + (end - start), start + 50 < end && start + 500 > end);
+        assertTrue("Wait time " + (end - start), start + 50 < end && start + 5000 > end);
 
         assertEquals(3, queue.remove().intValue());
     }
@@ -127,7 +127,7 @@ public class ArrayBlockingQueueTest {
         long end = System.currentTimeMillis();
         int b = queue.take();
 
-        assertTrue("Wait time " + (end - start), start + 100 < end && start + 900 > end);
+        assertTrue("Wait time " + (end - start), start + 100 < end && start + 5000 > end);
         assertEquals(1, a);
         assertEquals(2, b);
     }