diff --git a/core/src/main/java/com/google/net/stubby/newtransport/okhttp/OkHttpClientTransport.java b/core/src/main/java/com/google/net/stubby/newtransport/okhttp/OkHttpClientTransport.java
index efff989f7f..8baafc09fc 100644
--- a/core/src/main/java/com/google/net/stubby/newtransport/okhttp/OkHttpClientTransport.java
+++ b/core/src/main/java/com/google/net/stubby/newtransport/okhttp/OkHttpClientTransport.java
@@ -149,6 +149,9 @@ public class OkHttpClientTransport extends AbstractClientTransport {
       Variant variant = new Http20Draft14();
       frameReader = variant.newReader(source, true);
       frameWriter = new AsyncFrameWriter(variant.newWriter(sink, true), this, executor);
+      frameWriter.connectionPreface();
+      Settings settings = new Settings();
+      frameWriter.settings(settings);
     }
 
     clientFrameHandler = new ClientFrameHandler();