1 files changed, 1 insertions, 0 deletions
diff --git a/csharp/src/Google.Protobuf/Reflection/FieldAccessorBase.cs b/csharp/src/Google.Protobuf/Reflection/FieldAccessorBase.cs
index 82ce5051..85b7d39a 100644
--- a/csharp/src/Google.Protobuf/Reflection/FieldAccessorBase.cs
+++ b/csharp/src/Google.Protobuf/Reflection/FieldAccessorBase.cs
@@ -57,6 +57,7 @@ namespace Google.Protobuf.Reflection
             return getValueDelegate(message);
         }
 
+        public abstract bool HasValue(IMessage message);
         public abstract void Clear(IMessage message);
         public abstract void SetValue(IMessage message, object value);
     }