diff --git a/sdrgui/gui/audiodialog.cpp b/sdrgui/gui/audiodialog.cpp
index b96072ace..fe491f7e6 100644
--- a/sdrgui/gui/audiodialog.cpp
+++ b/sdrgui/gui/audiodialog.cpp
@@ -3,6 +3,7 @@
 #include <audio/audiodevicemanager.h>
 #include <QTreeWidgetItem>
 #include "ui_audiodialog.h"
+#include <math.h>
 
 AudioDialogX::AudioDialogX(AudioDeviceManager* audioDeviceManager, QWidget* parent) :
 	QDialog(parent),