diff --git a/protobuf-api/src/main/java/com/google/protobuf/GeneratedMessageLite.java b/protobuf-api/src/main/java/com/google/protobuf/GeneratedMessageLite.java
index c153960..76fbcaa 100644
--- a/protobuf-api/src/main/java/com/google/protobuf/GeneratedMessageLite.java
+++ b/protobuf-api/src/main/java/com/google/protobuf/GeneratedMessageLite.java
@@ -34,7 +34,7 @@
  *
  * @author kenton@google.com Kenton Varda
  */
-public abstract class GeneratedMessageLite<
+abstract class GeneratedMessageLite<
         MessageType extends GeneratedMessageLite<MessageType, BuilderType>,
         BuilderType extends GeneratedMessageLite.Builder<MessageType, BuilderType>>
     extends AbstractMessageLite<MessageType, BuilderType> {
diff --git a/protobuf-api/src/main/java/com/google/protobuf/MapEntryLite.java b/protobuf-api/src/main/java/com/google/protobuf/MapEntryLite.java
index 99f3460..61b1f65 100644
--- a/protobuf-api/src/main/java/com/google/protobuf/MapEntryLite.java
+++ b/protobuf-api/src/main/java/com/google/protobuf/MapEntryLite.java
@@ -19,7 +19,7 @@
  *
  * <p>Protobuf internal. Users shouldn't use.
  */
-public class MapEntryLite<K, V> {
+class MapEntryLite<K, V> {
 
   static class Metadata<K, V> {
     public final WireFormat.FieldType keyType;
diff --git a/protobuf-api/src/main/java/com/google/protobuf/MapFieldLite.java b/protobuf-api/src/main/java/com/google/protobuf/MapFieldLite.java
index bc5704b..a94825c 100644
--- a/protobuf-api/src/main/java/com/google/protobuf/MapFieldLite.java
+++ b/protobuf-api/src/main/java/com/google/protobuf/MapFieldLite.java
@@ -21,7 +21,7 @@
  *
  * <p>This class is a protobuf implementation detail. Users shouldn't use this class directly.
  */
-public final class MapFieldLite<K, V> extends LinkedHashMap<K, V> {
+final class MapFieldLite<K, V> extends LinkedHashMap<K, V> {
 
   private boolean isMutable;
 
diff --git a/protobuf-api/src/main/java/com/google/protobuf/UnknownFieldSetLite.java b/protobuf-api/src/main/java/com/google/protobuf/UnknownFieldSetLite.java
index 36c9481..809ac95 100644
--- a/protobuf-api/src/main/java/com/google/protobuf/UnknownFieldSetLite.java
+++ b/protobuf-api/src/main/java/com/google/protobuf/UnknownFieldSetLite.java
@@ -20,7 +20,7 @@
  *
  * @author dweis@google.com (Daniel Weis)
  */
-public final class UnknownFieldSetLite {
+final class UnknownFieldSetLite {
 
   // Arbitrarily chosen.
   // TODO: Tune this number?