diff --git a/netwerk/protocol/http/TunnelUtils.cpp b/netwerk/protocol/http/TunnelUtils.cpp
index 15efa5f82644..68045343afe8 100644
--- a/netwerk/protocol/http/TunnelUtils.cpp
+++ b/netwerk/protocol/http/TunnelUtils.cpp
@@ -356,18 +356,20 @@ nsresult TLSFilterTransaction::ReadSegments(nsAHttpSegmentReader* aReader,
   return NS_SUCCEEDED(rv) ? mReadSegmentReturnValue : rv;
 }
 
-nsresult TLSFilterTransaction::WriteSegments(nsAHttpSegmentWriter* aWriter,
-                                             uint32_t aCount,
-                                             uint32_t* outCountWritten) {
+nsresult TLSFilterTransaction::WriteSegmentsAgain(nsAHttpSegmentWriter* aWriter,
+                                                  uint32_t aCount,
+                                                  uint32_t* outCountWritten,
+                                                  bool* again) {
   MOZ_ASSERT(OnSocketThread(), "not on socket thread");
-  LOG(("TLSFilterTransaction::WriteSegments %p max=%d\n", this, aCount));
+  LOG(("TLSFilterTransaction::WriteSegmentsAgain %p max=%d\n", this, aCount));
 
   if (!mTransaction) {
     return NS_ERROR_UNEXPECTED;
   }
 
   mSegmentWriter = aWriter;
-  nsresult rv = mTransaction->WriteSegments(this, aCount, outCountWritten);
+  nsresult rv =
+      mTransaction->WriteSegmentsAgain(this, aCount, outCountWritten, again);
   if (NS_SUCCEEDED(rv) && NS_FAILED(mFilterReadCode) && !(*outCountWritten)) {
     // nsPipe turns failures into silent OK.. undo that!
     rv = mFilterReadCode;
@@ -381,6 +383,13 @@ nsresult TLSFilterTransaction::WriteSegments(nsAHttpSegmentWriter* aWriter,
   return rv;
 }
 
+nsresult TLSFilterTransaction::WriteSegments(nsAHttpSegmentWriter* aWriter,
+                                             uint32_t aCount,
+                                             uint32_t* outCountWritten) {
+  bool again = false;
+  return WriteSegmentsAgain(aWriter, aCount, outCountWritten, &again);
+}
+
 nsresult TLSFilterTransaction::GetTransactionSecurityInfo(
     nsISupports** outSecInfo) {
   if (!mSecInfo) {
diff --git a/netwerk/protocol/http/TunnelUtils.h b/netwerk/protocol/http/TunnelUtils.h
index a0fc7722e367..de86a5045392 100644
--- a/netwerk/protocol/http/TunnelUtils.h
+++ b/netwerk/protocol/http/TunnelUtils.h
@@ -144,6 +144,10 @@ class TLSFilterTransaction final : public nsAHttpTransaction,
   NullHttpTransaction* QueryNullTransaction() override;
   nsHttpTransaction* QueryHttpTransaction() override;
   SpdyConnectTransaction* QuerySpdyConnectTransaction() override;
+  MOZ_MUST_USE nsresult WriteSegmentsAgain(nsAHttpSegmentWriter* writer,
+                                           uint32_t count,
+                                           uint32_t* countWritten,
+                                           bool* again) override;
 
  private:
   MOZ_MUST_USE nsresult StartTimerCallback();