diff --git a/sdrgui/device/devicesourceapi.cpp b/sdrgui/device/devicesourceapi.cpp
index f037e025f..6af3f9ac7 100644
--- a/sdrgui/device/devicesourceapi.cpp
+++ b/sdrgui/device/devicesourceapi.cpp
@@ -22,12 +22,11 @@
 #include "plugin/plugininterface.h"
 #include "gui/glspectrum.h"
 #include "gui/channelwindow.h"
-#include "mainwindow.h"
 #include "settings/preset.h"
+#include "dsp/dspengine.h"
 
 // TODO: extract GUI dependencies in a separate object
-DeviceSourceAPI::DeviceSourceAPI(MainWindow *mainWindow,
-        int deviceTabIndex,
+DeviceSourceAPI::DeviceSourceAPI(int deviceTabIndex,
         DSPDeviceSourceEngine *deviceSourceEngine,
         GLSpectrum *glSpectrum,
         ChannelWindow *channelWindow) :
@@ -40,7 +39,7 @@ DeviceSourceAPI::DeviceSourceAPI(MainWindow *mainWindow,
     m_sampleSourcePluginInstanceUI(0),
     m_buddySharedPtr(0),
     m_isBuddyLeader(false),
-    m_masterTimer(mainWindow->getMasterTimer()) // TODO: get master timer directly not from main window
+    m_masterTimer(DSPEngine::instance()->getMasterTimer()) // TODO: get master timer directly not from main window
 {
 }
 
diff --git a/sdrgui/device/devicesourceapi.h b/sdrgui/device/devicesourceapi.h
index f064de5ea..f303822d6 100644
--- a/sdrgui/device/devicesourceapi.h
+++ b/sdrgui/device/devicesourceapi.h
@@ -25,7 +25,6 @@
 
 #include "util/export.h"
 
-class MainWindow;
 class GLSpectrum;
 class ChannelWindow;
 class BasebandSampleSink;
@@ -131,8 +130,7 @@ protected:
 
     typedef QList<ChannelInstanceRegistration> ChannelInstanceRegistrations;
 
-    DeviceSourceAPI(MainWindow *mainWindow,
-            int deviceTabIndex,
+    DeviceSourceAPI(int deviceTabIndex,
             DSPDeviceSourceEngine *deviceSourceEngine,
             GLSpectrum *glSpectrum,
             ChannelWindow *channelWindow);
diff --git a/sdrgui/mainwindow.cpp b/sdrgui/mainwindow.cpp
index 957485e30..1625064db 100644
--- a/sdrgui/mainwindow.cpp
+++ b/sdrgui/mainwindow.cpp
@@ -203,7 +203,7 @@ void MainWindow::addSourceDevice()
     char tabNameCStr[16];
     sprintf(tabNameCStr, "R%d", deviceTabIndex);
 
-    DeviceSourceAPI *deviceSourceAPI = new DeviceSourceAPI(this, deviceTabIndex, dspDeviceSourceEngine, m_deviceUIs.back()->m_spectrum, m_deviceUIs.back()->m_channelWindow);
+    DeviceSourceAPI *deviceSourceAPI = new DeviceSourceAPI(deviceTabIndex, dspDeviceSourceEngine, m_deviceUIs.back()->m_spectrum, m_deviceUIs.back()->m_channelWindow);
 
     m_deviceUIs.back()->m_deviceSourceAPI = deviceSourceAPI;
     m_deviceUIs.back()->m_samplingDeviceControl->setDeviceAPI(deviceSourceAPI);