diff --git a/plugins/samplesink/limesdroutput/limesdroutputthread.cpp b/plugins/samplesink/limesdroutput/limesdroutputthread.cpp
index d7c64132a..7a5d3c7e0 100644
--- a/plugins/samplesink/limesdroutput/limesdroutputthread.cpp
+++ b/plugins/samplesink/limesdroutput/limesdroutputthread.cpp
@@ -83,7 +83,7 @@ void LimeSDROutputThread::run()
 
     while (m_running)
     {
-        callback(m_buf, 2 * res);
+        callback(m_buf, LIMESDROUTPUT_BLOCKSIZE);
 
         if ((res = LMS_SendStream(m_stream, (void *) m_buf, LIMESDROUTPUT_BLOCKSIZE, &metadata, 1000)) < 0)
         {