diff --git a/module-client/src/test/java/org/apache/http/impl/conn/ExecReqThread.java b/module-client/src/test/java/org/apache/http/impl/conn/ExecReqThread.java
index 265071aaf..38fd6b0a0 100644
--- a/module-client/src/test/java/org/apache/http/impl/conn/ExecReqThread.java
+++ b/module-client/src/test/java/org/apache/http/impl/conn/ExecReqThread.java
@@ -50,9 +50,9 @@ import org.apache.http.util.EntityUtils;
  */
 public class ExecReqThread extends GetConnThread {
 
-    protected RequestSpec  request_spec;
-    protected HttpResponse response;
-    protected byte[]       response_data;
+    protected          RequestSpec  request_spec;
+    protected volatile HttpResponse response;
+    protected volatile byte[]       response_data;
 
 
     /**
diff --git a/module-client/src/test/java/org/apache/http/impl/conn/GetConnThread.java b/module-client/src/test/java/org/apache/http/impl/conn/GetConnThread.java
index 6da5f6211..9e98f4f2f 100644
--- a/module-client/src/test/java/org/apache/http/impl/conn/GetConnThread.java
+++ b/module-client/src/test/java/org/apache/http/impl/conn/GetConnThread.java
@@ -48,8 +48,8 @@ public class GetConnThread extends Thread {
     protected HttpRoute               conn_route;
     protected long                    conn_timeout;
 
-    protected ManagedClientConnection connection;
-    protected Throwable               exception;
+    protected volatile ManagedClientConnection connection;
+    protected volatile Throwable               exception;
 
     /**
      * Creates a new thread.
diff --git a/module-client/src/test/java/org/apache/http/impl/conn/tsccm/AwaitThread.java b/module-client/src/test/java/org/apache/http/impl/conn/tsccm/AwaitThread.java
index 2e5c3510c..6a61259c6 100644
--- a/module-client/src/test/java/org/apache/http/impl/conn/tsccm/AwaitThread.java
+++ b/module-client/src/test/java/org/apache/http/impl/conn/tsccm/AwaitThread.java
@@ -44,8 +44,8 @@ public class AwaitThread extends Thread {
     protected Lock          wait_lock;
     protected Date          wait_deadline;
 
-    protected boolean       waiting;
-    protected Throwable     exception;
+    protected volatile boolean       waiting;
+    protected volatile Throwable     exception;
 
 
     /**