diff --git a/projects/examples/duplex.cpp b/projects/examples/duplex.cpp
index d7ffbb8..696dfd8 100644
--- a/projects/examples/duplex.cpp
+++ b/projects/examples/duplex.cpp
@@ -104,6 +104,7 @@ int main(int argc, char *argv[])
   RtAudio::StreamOptions options;
   //options.flags |= RTAUDIO_NONINTERLEAVED;
 
+  bufferBytes = bufferFrames * channels * sizeof( MY_TYPE );
   try {
     adac.openStream( &oParams, &iParams, FORMAT, fs, &bufferFrames, &inout, (void *)&bufferBytes, &options );
   }
@@ -112,7 +113,7 @@ int main(int argc, char *argv[])
     exit( 1 );
   }
 
-  bufferBytes = bufferFrames * channels * sizeof( MY_TYPE );
+
 
   // Test RtAudio functionality for reporting latency.
   std::cout << "\nStream latency = " << adac.getStreamLatency() << " frames" << std::endl;