diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackIndex.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackIndex.java
index c42d1c8..c2c3775 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackIndex.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackIndex.java
@@ -228,7 +228,7 @@
 	 *            etc. Positions past 2**31-1 are negative, but still valid.
 	 * @return the offset in a pack for the corresponding entry.
 	 */
-	abstract long getOffset(long nthPosition);
+	protected abstract long getOffset(long nthPosition);
 
 	/**
 	 * Locate the file offset position for the requested object.
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackIndexV1.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackIndexV1.java
index 4563c90..5180df4 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackIndexV1.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackIndexV1.java
@@ -118,7 +118,7 @@
 	}
 
 	@Override
-	long getOffset(long nthPosition) {
+	protected long getOffset(long nthPosition) {
 		final int levelOne = findLevelOne(nthPosition);
 		final int levelTwo = getLevelTwo(nthPosition, levelOne);
 		final int p = (4 + Constants.OBJECT_ID_LENGTH) * levelTwo;