diff --git a/tests/src/test/java/org/teavm/vm/VMTest.java b/tests/src/test/java/org/teavm/vm/VMTest.java
index ca8d233ca..30d4cf37e 100644
--- a/tests/src/test/java/org/teavm/vm/VMTest.java
+++ b/tests/src/test/java/org/teavm/vm/VMTest.java
@@ -270,7 +270,9 @@ public class VMTest {
 
             try {
                 Thread.sleep(1);
-                wait();
+                synchronized (AsyncClinitClass.this) {
+                    wait();
+                }
             } catch (InterruptedException ie) {
                 instanceState = "error";
                 throw new RuntimeException(ie);