diff --git a/gson/src/main/java/com/google/gson/GsonBuilder.java b/gson/src/main/java/com/google/gson/GsonBuilder.java
index 48732562..9141318f 100644
--- a/gson/src/main/java/com/google/gson/GsonBuilder.java
+++ b/gson/src/main/java/com/google/gson/GsonBuilder.java
@@ -431,7 +431,7 @@ public final class GsonBuilder {
    * @return a reference to this {@code GsonBuilder} object to fulfill the "Builder" pattern
    * @since 1.7
    */
-  GsonBuilder registerTypeHierarchyAdapter(Class<?> baseType, Object typeAdapter) {
+  public GsonBuilder registerTypeHierarchyAdapter(Class<?> baseType, Object typeAdapter) {
     Preconditions.checkArgument(typeAdapter instanceof JsonSerializer<?>
     || typeAdapter instanceof JsonDeserializer<?> || typeAdapter instanceof InstanceCreator<?>);
     if (typeAdapter instanceof InstanceCreator<?>) {