diff --git a/src/ProtocolBuffers/ByteString.cs b/src/ProtocolBuffers/ByteString.cs
index 545bf556c8..ea17ca1ee6 100644
--- a/src/ProtocolBuffers/ByteString.cs
+++ b/src/ProtocolBuffers/ByteString.cs
@@ -252,7 +252,10 @@ namespace Google.ProtocolBuffers
             }
         }
 
-        internal void WriteTo(CodedOutputStream outputStream)
+        /// <summary>
+        /// Used internally by CodedOutputStream to avoid creating a copy for the write
+        /// </summary>
+        internal void WriteRawBytesTo(CodedOutputStream outputStream)
         {
             outputStream.WriteRawBytes(bytes, 0, bytes.Length);
         }
diff --git a/src/ProtocolBuffers/CodedOutputStream.cs b/src/ProtocolBuffers/CodedOutputStream.cs
index 59490df3b4..088db8ae62 100644
--- a/src/ProtocolBuffers/CodedOutputStream.cs
+++ b/src/ProtocolBuffers/CodedOutputStream.cs
@@ -360,7 +360,7 @@ namespace Google.ProtocolBuffers
         {
             WriteTag(fieldNumber, WireFormat.WireType.LengthDelimited);
             WriteRawVarint32((uint) value.Length);
-            value.WriteTo(this);
+            value.WriteRawBytesTo(this);
         }
 
         [CLSCompliant(false)]
@@ -637,7 +637,7 @@ namespace Google.ProtocolBuffers
         public void WriteBytesNoTag(ByteString value)
         {
             WriteRawVarint32((uint) value.Length);
-            value.WriteTo(this);
+            value.WriteRawBytesTo(this);
         }
 
         [CLSCompliant(false)]