diff --git a/ext/call.cc b/ext/call.cc
index 3256f41d..a720f9ee 100644
--- a/ext/call.cc
+++ b/ext/call.cc
@@ -464,10 +464,6 @@ void Call::Init(Handle<Object> exports) {
                           NanNew<FunctionTemplate>(GetPeer)->GetFunction());
   NanAssignPersistent(fun_tpl, tpl);
   Handle<Function> ctr = tpl->GetFunction();
-  ctr->Set(NanNew("WRITE_BUFFER_HINT"),
-           NanNew<Uint32, uint32_t>(GRPC_WRITE_BUFFER_HINT));
-  ctr->Set(NanNew("WRITE_NO_COMPRESS"),
-           NanNew<Uint32, uint32_t>(GRPC_WRITE_NO_COMPRESS));
   exports->Set(NanNew("Call"), ctr);
   constructor = new NanCallback(ctr);
 }
diff --git a/ext/node_grpc.cc b/ext/node_grpc.cc
index d93dafda..0cf30da9 100644
--- a/ext/node_grpc.cc
+++ b/ext/node_grpc.cc
@@ -196,6 +196,16 @@ void InitConnectivityStateConstants(Handle<Object> exports) {
   channel_state->Set(NanNew("FATAL_FAILURE"), FATAL_FAILURE);
 }
 
+void InitWriteFlags(Handle<Object> exports) {
+  NanScope();
+  Handle<Object> write_flags = NanNew<Object>();
+  exports->Set(NanNew("writeFlags"), write_flags);
+  Handle<Value> BUFFER_HINT(NanNew<Uint32, uint32_t>(GRPC_WRITE_BUFFER_HINT));
+  write_flags->Set(NanNew("BUFFER_HINT"), BUFFER_HINT);
+  Handle<Value> NO_COMPRESS(NanNew<Uint32, uint32_t>(GRPC_WRITE_NO_COMPRESS));
+  write_flags->Set(NanNew("NO_COMPRESS"), NO_COMPRESS);
+}
+
 void init(Handle<Object> exports) {
   NanScope();
   grpc_init();
@@ -204,6 +214,7 @@ void init(Handle<Object> exports) {
   InitOpTypeConstants(exports);
   InitPropagateConstants(exports);
   InitConnectivityStateConstants(exports);
+  InitWriteFlags(exports);
 
   grpc::node::Call::Init(exports);
   grpc::node::Channel::Init(exports);
diff --git a/index.js b/index.js
index 93c65ac5..889b0ac0 100644
--- a/index.js
+++ b/index.js
@@ -144,6 +144,11 @@ exports.propagate = grpc.propagate;
  */
 exports.callError = grpc.callError;
 
+/**
+ * Write flag name to code number mapping
+ */
+exports.writeFlags = grpc.writeFlags;
+
 /**
  * Credentials factories
  */