diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/FileTreeIteratorTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/FileTreeIteratorTest.java
index 209b2b837..a06149e84 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/FileTreeIteratorTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/FileTreeIteratorTest.java
@@ -49,6 +49,7 @@
 import static org.junit.Assert.assertTrue;
 
 import java.io.File;
+import java.io.IOException;
 import java.security.MessageDigest;
 
 import org.eclipse.jgit.api.Git;
@@ -58,6 +59,9 @@
 import org.eclipse.jgit.dircache.DirCacheEntry;
 import org.eclipse.jgit.dircache.DirCacheIterator;
 import org.eclipse.jgit.dircache.DirCacheEditor.PathEdit;
+import org.eclipse.jgit.errors.CorruptObjectException;
+import org.eclipse.jgit.errors.IncorrectObjectTypeException;
+import org.eclipse.jgit.errors.MissingObjectException;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.FileMode;
 import org.eclipse.jgit.lib.ObjectId;
@@ -429,6 +433,43 @@ public void apply(DirCacheEntry ent) {
 		assertTrue(indexIter.idEqual(workTreeIter));
 	}
 
+	@Test
+	public void idOffset() throws Exception {
+		Git git = new Git(db);
+		writeTrashFile("fileAinfsonly", "A");
+		File fileBinindex = writeTrashFile("fileBinindex", "B");
+		fsTick(fileBinindex);
+		git.add().addFilepattern("fileBinindex").call();
+		writeTrashFile("fileCinfsonly", "C");
+		TreeWalk tw = new TreeWalk(db);
+		DirCacheIterator indexIter = new DirCacheIterator(db.readDirCache());
+		FileTreeIterator workTreeIter = new FileTreeIterator(db);
+		tw.addTree(indexIter);
+		tw.addTree(workTreeIter);
+		workTreeIter.setDirCacheIterator(tw, 0);
+		assertEntry("d46c305e85b630558ee19cc47e73d2e5c8c64cdc", "a,", tw);
+		assertEntry("58ee403f98538ec02409538b3f80adf610accdec", "a,b", tw);
+		assertEntry("0000000000000000000000000000000000000000", "a", tw);
+		assertEntry("b8d30ff397626f0f1d3538d66067edf865e201d6", "a0b", tw);
+		// The reason for adding this test. Check that the id is correct for
+		// mixed
+		assertEntry("8c7e5a667f1b771847fe88c01c3de34413a1b220",
+				"fileAinfsonly", tw);
+		assertEntry("7371f47a6f8bd23a8fa1a8b2a9479cdd76380e54", "fileBinindex",
+				tw);
+		assertEntry("96d80cd6c4e7158dbebd0849f4fb7ce513e5828c",
+				"fileCinfsonly", tw);
+		assertFalse(tw.next());
+	}
+
+	private void assertEntry(String sha1string, String path, TreeWalk tw)
+			throws MissingObjectException, IncorrectObjectTypeException,
+			CorruptObjectException, IOException {
+		assertTrue(tw.next());
+		assertEquals(path, tw.getPathString());
+		assertEquals(sha1string, tw.getObjectId(1).getName() /* 1=filetree here */);
+	}
+
 	private static String nameOf(final AbstractTreeIterator i) {
 		return RawParseUtils.decode(Constants.CHARSET, i.path, 0, i.pathLen);
 	}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/WorkingTreeIterator.java b/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/WorkingTreeIterator.java
index 8d0555bf9..9ee5f8b11 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/WorkingTreeIterator.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/WorkingTreeIterator.java
@@ -243,6 +243,8 @@ public byte[] idBuffer() {
 					return contentId = i.idBuffer();
 				}
 				contentIdOffset = 0;
+			} else {
+				contentIdOffset = 0;
 			}
 		}
 		switch (mode & FileMode.TYPE_MASK) {