diff --git a/src/qamqpclient.cpp b/src/qamqpclient.cpp
index d6eedfe..aa6f0cc 100644
--- a/src/qamqpclient.cpp
+++ b/src/qamqpclient.cpp
@@ -504,7 +504,7 @@ void QAmqpClientPrivate::tuneOk()
 
     stream << qint16(channelMax);
     stream << qint32(frameMax);
-    stream << qint16(heartbeatDelay / 1000);
+    stream << qint16(heartbeatDelay);
 
     frame.setArguments(arguments);
     sendFrame(frame);