1 files changed, 0 insertions, 3 deletions
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/FieldMask.cs b/csharp/src/Google.Protobuf/WellKnownTypes/FieldMask.cs
index c090aae8..45ef9859 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/FieldMask.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/FieldMask.cs
@@ -51,9 +51,6 @@ namespace Google.Protobuf.WellKnownTypes {
       get { return Descriptor; }
     }
 
-    private bool _frozen = false;
-    public bool IsFrozen { get { return _frozen; } }
-
     public FieldMask() {
       OnConstruction();
     }