diff --git a/main/src/mockit/internal/mockups/MockClassSetup.java b/main/src/mockit/internal/mockups/MockClassSetup.java
index b9e518ee3..f9fe9cf51 100644
--- a/main/src/mockit/internal/mockups/MockClassSetup.java
+++ b/main/src/mockit/internal/mockups/MockClassSetup.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2014 Rogério Liesenfeld
+ * Copyright (c) 2006-2015 Rogério Liesenfeld
  * This file is subject to the terms of the MIT license (see LICENSE.txt).
  */
 package mockit.internal.mockups;
@@ -15,7 +15,6 @@
 import mockit.internal.state.*;
 import mockit.internal.util.*;
 import static mockit.external.asm.ClassReader.*;
-import static mockit.internal.util.Utilities.*;
 
 import org.jetbrains.annotations.*;
 
@@ -106,10 +105,6 @@ private Set<Class<?>> redefineMethodsInClassHierarchy()
    private byte[] modifyRealClass(@NotNull Class<?> classToModify)
    {
       if (rcReader == null) {
-         if (!HOTSPOT_VM && classToModify == System.class) {
-            return null;
-         }
-
          rcReader = createClassReaderForRealClass(classToModify);
       }
 
diff --git a/main/test/mockit/ReentrantMockTest.java b/main/test/mockit/ReentrantMockTest.java
index a672f5c9e..e0087366a 100644
--- a/main/test/mockit/ReentrantMockTest.java
+++ b/main/test/mockit/ReentrantMockTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2014 Rogério Liesenfeld
+ * Copyright (c) 2006-2015 Rogério Liesenfeld
  * This file is subject to the terms of the MIT license (see LICENSE.txt).
  */
 package mockit;
@@ -9,6 +9,8 @@
 import org.junit.*;
 import static org.junit.Assert.*;
 
+import static mockit.internal.util.Utilities.*;
+
 public final class ReentrantMockTest
 {
    public static class RealClass
@@ -228,24 +230,28 @@ public void reentrantMockForJREClassWhichCallsAnotherFromADifferentThread()
       System.setProperty("a", "1");
       System.setProperty("b", "2");
 
-      new MockUp<System>() {
-         String property;
+      if (HOTSPOT_VM) { // causes main thread to hang up on IBM JRE
+         new MockUp<System>()
+         {
+            String property;
 
-         @Mock
-         String getProperty(Invocation inv, String key) { return inv.proceed(); }
+            @Mock
+            String getProperty(Invocation inv, String key) { return inv.proceed(); }
 
-         @Mock
-         String clearProperty(final String key) throws InterruptedException
-         {
-            Thread t = new Thread() {
-               @Override
-               public void run() { property = System.getProperty(key); }
-            };
-            t.start();
-            t.join();
-            return property;
-         }
-      };
+            @Mock
+            String clearProperty(final String key) throws InterruptedException
+            {
+               Thread t = new Thread()
+               {
+                  @Override
+                  public void run() { property = System.getProperty(key); }
+               };
+               t.start();
+               t.join();
+               return property;
+            }
+         };
+      }
 
       assertEquals("1", System.getProperty("a"));
       assertEquals("2", System.clearProperty("b"));