diff --git a/include/dsp/samplefifo.h b/include/dsp/samplefifo.h
index 6fb05a748..24a2a6146 100644
--- a/include/dsp/samplefifo.h
+++ b/include/dsp/samplefifo.h
@@ -47,6 +47,7 @@ public:
 	~SampleFifo();
 
 	bool setSize(int size);
+	inline uint size() const { return m_size; }
 	inline uint fill() const { return m_fill; }
 
 	uint write(const quint8* data, uint count);
diff --git a/plugins/samplesource/filesource/filesourcegui.ui b/plugins/samplesource/filesource/filesourcegui.ui
index 938e6147a..382bb1968 100644
--- a/plugins/samplesource/filesource/filesourcegui.ui
+++ b/plugins/samplesource/filesource/filesourcegui.ui
@@ -205,14 +205,14 @@
        </property>
        <property name="icon">
         <iconset resource="../../../sdrbase/resources/res.qrc">
-         <normaloff>:/pause.png</normaloff>
-         <normalon>:/play.png</normalon>
+         <normaloff>:/play.png</normaloff>
+         <normalon>:/pause.png</normalon>
          <disabledoff>:/stop.png</disabledoff>
          <disabledon>:/stop.png</disabledon>
-         <activeoff>:/pause.png</activeoff>
-         <activeon>:/play.png</activeon>
-         <selectedoff>:/pause.png</selectedoff>
-         <selectedon>:/play.png</selectedon>:/pause.png</iconset>
+         <activeoff>:/play.png</activeoff>
+         <activeon>:/pause.png</activeon>
+         <selectedoff>:/play.png</selectedoff>
+         <selectedon>:/pause.png</selectedon>:/pause.png</iconset>
        </property>
        <property name="iconSize">
         <size>
diff --git a/plugins/samplesource/filesource/filesourceinput.cpp b/plugins/samplesource/filesource/filesourceinput.cpp
index b8229f03b..99dde4650 100644
--- a/plugins/samplesource/filesource/filesourceinput.cpp
+++ b/plugins/samplesource/filesource/filesourceinput.cpp
@@ -102,6 +102,11 @@ bool FileSourceInput::startInput(int device)
 	std::cerr << "FileSourceInput::startInput" << std::endl;
 	QMutexLocker mutexLocker(&m_mutex);
 
+	if(!m_sampleFifo.setSize(96000 * 4)) {
+		qCritical("Could not allocate SampleFifo");
+		return false;
+	}
+
 	openFileStream();
 
 	if((m_fileSourceThread = new FileSourceThread(&m_ifstream, &m_sampleFifo)) == NULL) {