diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCache.java b/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCache.java
index bb725b7..03da615 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCache.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCache.java
@@ -1033,7 +1033,7 @@
 		 */
 		DIRC_VERSION_PATHCOMPRESS(4);
 
-		private int version;
+		private final int version;
 
 		private DirCacheVersion(int versionCode) {
 			this.version = versionCode;