diff --git a/lucene/CHANGES.txt b/lucene/CHANGES.txt
index 79ddabb06bc..e939ea00c37 100644
--- a/lucene/CHANGES.txt
+++ b/lucene/CHANGES.txt
@@ -711,6 +711,12 @@ Bug fixes
 * LUCENE-3627: Don't let an errant 0-byte segments_N file corrupt the index.
   (Ken McCracken via Mike McCandless)
 
+* LUCENE-3630: The internal method MultiReader.doOpenIfChanged(boolean doClone)
+  was overriding IndexReader.doOpenIfChanged(boolean readOnly), so changing the
+  contract of the overridden method. This method was renamed and made private.
+  In ParallelReader the bug was not existent, but the implementation method
+  was also made private.  (Uwe Schindler)
+
 Documentation
 
 * LUCENE-3597: Fixed incorrect grouping documentation. (Martijn van Groningen, Robert Muir)
diff --git a/lucene/src/java/org/apache/lucene/index/MultiReader.java b/lucene/src/java/org/apache/lucene/index/MultiReader.java
index fdc364dfe4f..94f12da290e 100644
--- a/lucene/src/java/org/apache/lucene/index/MultiReader.java
+++ b/lucene/src/java/org/apache/lucene/index/MultiReader.java
@@ -108,7 +108,7 @@ public class MultiReader extends IndexReader implements Cloneable {
    */
   @Override
   protected synchronized IndexReader doOpenIfChanged() throws CorruptIndexException, IOException {
-    return doOpenIfChanged(false);
+    return doReopen(false);
   }
   
   /**
@@ -123,7 +123,7 @@ public class MultiReader extends IndexReader implements Cloneable {
   @Override
   public synchronized Object clone() {
     try {
-      return doOpenIfChanged(true);
+      return doReopen(true);
     } catch (Exception ex) {
       throw new RuntimeException(ex);
     }
@@ -141,7 +141,7 @@ public class MultiReader extends IndexReader implements Cloneable {
    * @throws CorruptIndexException
    * @throws IOException
    */
-  protected IndexReader doOpenIfChanged(boolean doClone) throws CorruptIndexException, IOException {
+  private IndexReader doReopen(boolean doClone) throws CorruptIndexException, IOException {
     ensureOpen();
     
     boolean changed = false;
diff --git a/lucene/src/java/org/apache/lucene/index/ParallelReader.java b/lucene/src/java/org/apache/lucene/index/ParallelReader.java
index 8ce4258c3a8..7b7bd52366e 100644
--- a/lucene/src/java/org/apache/lucene/index/ParallelReader.java
+++ b/lucene/src/java/org/apache/lucene/index/ParallelReader.java
@@ -247,7 +247,7 @@ public class ParallelReader extends IndexReader {
     return doReopen(false);
   }
     
-  protected IndexReader doReopen(boolean doClone) throws CorruptIndexException, IOException {
+  private IndexReader doReopen(boolean doClone) throws CorruptIndexException, IOException {
     ensureOpen();
     
     boolean reopened = false;