diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/AnyObjectId.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/AnyObjectId.java
index aeb0812c4..bee5ff9ef 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/AnyObjectId.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/AnyObjectId.java
@@ -219,7 +219,7 @@ public abstract class AnyObjectId implements Comparable {
 		return abbr.prefixCompare(this) == 0;
 	}
 
-	public int hashCode() {
+	public final int hashCode() {
 		return w2;
 	}