diff --git a/plugins/channel/demodam/amdemod.cpp b/plugins/channel/demodam/amdemod.cpp
index 54fe75e28..669b13135 100644
--- a/plugins/channel/demodam/amdemod.cpp
+++ b/plugins/channel/demodam/amdemod.cpp
@@ -28,6 +28,7 @@
 MESSAGE_CLASS_DEFINITION(AMDemod::MsgConfigureAMDemod, Message)
 
 AMDemod::AMDemod() :
+    m_squelchOpen(false),
 	m_audioFifo(4, 48000),
 	m_settingsMutex(QMutex::Recursive)
 {
@@ -124,11 +125,12 @@ void AMDemod::feed(const SampleVector::const_iterator& begin, const SampleVector
 				demod *= ((0.003 * attack) / m_volumeAGC.getValue());
 				demod *= m_running.m_volume;
 				sample = demod * 32700 * 16;
-
+				m_squelchOpen = true;
 			}
 			else
 			{
 				sample = 0;
+				m_squelchOpen = false;
 			}
 
 			m_audioBuffer[m_audioBufferFill].l = sample;
diff --git a/plugins/channel/demodam/amdemod.h b/plugins/channel/demodam/amdemod.h
index 5e5f37b4c..b37095a69 100644
--- a/plugins/channel/demodam/amdemod.h
+++ b/plugins/channel/demodam/amdemod.h
@@ -42,6 +42,7 @@ public:
 	virtual bool handleMessage(const Message& cmd);
 
 	Real getMagSq() const { return m_magsq; }
+	bool getSquelchOpen() const { return m_squelchOpen; }
 
 private:
 	class MsgConfigureAMDemod : public Message {
@@ -120,6 +121,7 @@ private:
 
 	Real m_squelchLevel;
 	int m_squelchCount;
+	bool m_squelchOpen;
 	Real m_magsq;
 
 	MovingAverage<Real> m_movingAverage;
diff --git a/plugins/channel/demodam/amdemodgui.cpp b/plugins/channel/demodam/amdemodgui.cpp
index e439cdd56..04ec9cdf5 100644
--- a/plugins/channel/demodam/amdemodgui.cpp
+++ b/plugins/channel/demodam/amdemodgui.cpp
@@ -207,7 +207,8 @@ AMDemodGUI::AMDemodGUI(PluginAPI* pluginAPI, QWidget* parent) :
 	m_channelMarker(this),
 	m_basicSettingsShown(false),
 	m_doApplySettings(true),
-	m_channelPowerDbAvg(20,0)
+	m_channelPowerDbAvg(20,0),
+	m_squelchOpen(false)
 {
 	ui->setupUi(this);
 	setAttribute(Qt::WA_DeleteOnClose, true);
@@ -290,5 +291,17 @@ void AMDemodGUI::tick()
 	Real powDb = CalcDb::dbPower(m_amDemod->getMagSq());
 	m_channelPowerDbAvg.feed(powDb);
 	ui->channelPower->setText(QString::number(m_channelPowerDbAvg.average(), 'f', 1));
+	bool squelchOpen = m_amDemod->getSquelchOpen();
+
+	if (squelchOpen != m_squelchOpen)
+	{
+		m_squelchOpen = squelchOpen;
+
+		if (m_squelchOpen) {
+			ui->audioMute->setStyleSheet("QToolButton { background-color : green; }");
+		} else {
+			ui->audioMute->setStyleSheet("QToolButton { background:rgb(79,79,79); }");
+		}
+	}
 }
 
diff --git a/plugins/channel/demodam/amdemodgui.h b/plugins/channel/demodam/amdemodgui.h
index 12477a389..d920485fd 100644
--- a/plugins/channel/demodam/amdemodgui.h
+++ b/plugins/channel/demodam/amdemodgui.h
@@ -58,6 +58,7 @@ private:
 	Channelizer* m_channelizer;
 	AMDemod* m_amDemod;
 	MovingAverage<Real> m_channelPowerDbAvg;
+	bool m_squelchOpen;
 
 	static const int m_rfBW[];