diff --git a/sdrbase/dsp/dvserialworker.cpp b/sdrbase/dsp/dvserialworker.cpp
index 51939197b..16ed7b439 100644
--- a/sdrbase/dsp/dvserialworker.cpp
+++ b/sdrbase/dsp/dvserialworker.cpp
@@ -76,7 +76,7 @@ void DVSerialWorker::handleInputMessages()
         if (MsgMbeDecode::match(*message))
         {
             MsgMbeDecode *decodeMsg = (MsgMbeDecode *) message;
-            int dBVolume = (decodeMsg->getVolumeIndex() - 50) / 5;
+            int dBVolume = (decodeMsg->getVolumeIndex() - 50) / 4;
 
             if (m_dvController.decode(m_dvAudioSamples, decodeMsg->getMbeFrame(), decodeMsg->getMbeRate(), dBVolume))
             {
diff --git a/sdrbase/dsp/interpolator.h b/sdrbase/dsp/interpolator.h
index ed6d7b0d4..6ec98977f 100644
--- a/sdrbase/dsp/interpolator.h
+++ b/sdrbase/dsp/interpolator.h
@@ -7,7 +7,7 @@
 #include "dsp/dsptypes.h"
 #include "util/export.h"
 #include <stdio.h>
-#ifndef WIN32
+#ifndef __WINDOWS__
 #include <unistd.h>
 #endif