diff --git a/hadoop-common-project/hadoop-common/CHANGES.txt b/hadoop-common-project/hadoop-common/CHANGES.txt
index d0b4e3ed881..1099a3984ef 100644
--- a/hadoop-common-project/hadoop-common/CHANGES.txt
+++ b/hadoop-common-project/hadoop-common/CHANGES.txt
@@ -430,6 +430,10 @@ Release 2.7.1 - UNRELEASED
     HADOOP-12078. The default retry policy does not handle RetriableException
     correctly. (Arpit Agarwal)
 
+    HADOOP-12100. ImmutableFsPermission should not override applyUmask since
+    that method doesn't modify the FsPermission (Bibin A Chundatt via Colin P.
+    McCabe)
+
 Release 2.7.0 - 2015-04-20
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/permission/FsPermission.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/permission/FsPermission.java
index 264a0952706..0258293823e 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/permission/FsPermission.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/permission/FsPermission.java
@@ -375,13 +375,10 @@ private static class ImmutableFsPermission extends FsPermission {
     public ImmutableFsPermission(short permission) {
       super(permission);
     }
-    @Override
-    public FsPermission applyUMask(FsPermission umask) {
-      throw new UnsupportedOperationException();
-    }
+
     @Override
     public void readFields(DataInput in) throws IOException {
       throw new UnsupportedOperationException();
-    }    
+    }
   }
 }