diff --git a/gson/src/main/java/com/google/gson/DelegatingJsonElementVisitor.java b/gson/src/main/java/com/google/gson/DelegatingJsonElementVisitor.java
index a16bac05..a3970e4d 100644
--- a/gson/src/main/java/com/google/gson/DelegatingJsonElementVisitor.java
+++ b/gson/src/main/java/com/google/gson/DelegatingJsonElementVisitor.java
@@ -46,7 +46,7 @@ import java.io.IOException;
  *
  * @author Joel Leitch
  */
-class DelegatingJsonElementVisitor implements JsonElementVisitor {
+final class DelegatingJsonElementVisitor implements JsonElementVisitor {
   private final JsonElementVisitor delegate;
 
   protected DelegatingJsonElementVisitor(JsonElementVisitor delegate) {
diff --git a/gson/src/main/java/com/google/gson/JsonDeserializerExceptionWrapper.java b/gson/src/main/java/com/google/gson/JsonDeserializerExceptionWrapper.java
index b800c318..860b1cac 100644
--- a/gson/src/main/java/com/google/gson/JsonDeserializerExceptionWrapper.java
+++ b/gson/src/main/java/com/google/gson/JsonDeserializerExceptionWrapper.java
@@ -30,7 +30,7 @@ import java.lang.reflect.Type;
  * @author Inderjeet Singh
  * @author Joel Leitch
  */
-class JsonDeserializerExceptionWrapper<T> implements JsonDeserializer<T> {
+final class JsonDeserializerExceptionWrapper<T> implements JsonDeserializer<T> {
 
   private final JsonDeserializer<T> delegate;