diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/TreeWalk.java b/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/TreeWalk.java
index 3ecef453e..a4d2d7e79 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/TreeWalk.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/TreeWalk.java
@@ -195,6 +195,8 @@ public class TreeWalk implements AutoCloseable {
 
 	private final ObjectReader reader;
 
+	private final boolean closeReader;
+
 	private final MutableObjectId idBuffer = new MutableObjectId();
 
 	private TreeFilter filter;
@@ -217,22 +219,30 @@ public class TreeWalk implements AutoCloseable {
 	 * Create a new tree walker for a given repository.
 	 *
 	 * @param repo
-	 *            the repository the walker will obtain data from.
+	 *            the repository the walker will obtain data from. An
+	 *            ObjectReader will be created by the walker, and will be closed
+	 *            when the walker is closed.
 	 */
 	public TreeWalk(final Repository repo) {
-		this(repo.newObjectReader());
+		this(repo.newObjectReader(), true);
 	}
 
 	/**
 	 * Create a new tree walker for a given repository.
 	 *
 	 * @param or
-	 *            the reader the walker will obtain tree data from.
+	 *            the reader the walker will obtain tree data from. The reader
+	 *            is not closed when the walker is closed.
 	 */
 	public TreeWalk(final ObjectReader or) {
+		this(or, false);
+	}
+
+	private TreeWalk(final ObjectReader or, final boolean closeReader) {
 		reader = or;
 		filter = TreeFilter.ALL;
 		trees = NO_TREES;
+		this.closeReader = closeReader;
 	}
 
 	/** @return the reader this walker is using to load objects. */
@@ -261,7 +271,9 @@ public class TreeWalk implements AutoCloseable {
 	 */
 	@Override
 	public void close() {
-		reader.close();
+		if (closeReader) {
+			reader.close();
+		}
 	}
 
 	/**