diff --git a/asterix-common/src/main/java/edu/uci/ics/asterix/common/api/AsterixThreadExecutor.java b/asterix-common/src/main/java/edu/uci/ics/asterix/common/api/AsterixThreadExecutor.java
index ce2284c..14975ff 100644
--- a/asterix-common/src/main/java/edu/uci/ics/asterix/common/api/AsterixThreadExecutor.java
+++ b/asterix-common/src/main/java/edu/uci/ics/asterix/common/api/AsterixThreadExecutor.java
@@ -18,7 +18,7 @@
 import java.util.concurrent.Executors;
 
 public class AsterixThreadExecutor implements Executor {
-    public static AsterixThreadExecutor INSTANCE = new AsterixThreadExecutor();
+    public final static AsterixThreadExecutor INSTANCE = new AsterixThreadExecutor();
     private final Executor executor = Executors.newCachedThreadPool(AsterixThreadFactory.INSTANCE);
 
     private AsterixThreadExecutor() {
diff --git a/asterix-common/src/main/java/edu/uci/ics/asterix/common/api/AsterixThreadFactory.java b/asterix-common/src/main/java/edu/uci/ics/asterix/common/api/AsterixThreadFactory.java
index 5d11d6d..7e4735f 100644
--- a/asterix-common/src/main/java/edu/uci/ics/asterix/common/api/AsterixThreadFactory.java
+++ b/asterix-common/src/main/java/edu/uci/ics/asterix/common/api/AsterixThreadFactory.java
@@ -20,7 +20,7 @@
 
 public class AsterixThreadFactory implements ThreadFactory {
 
-    public static AsterixThreadFactory INSTANCE = new AsterixThreadFactory();
+    public final static AsterixThreadFactory INSTANCE = new AsterixThreadFactory();
 
     private AsterixThreadFactory() {