diff --git a/plugins/Compressor/Compressor.cpp b/plugins/Compressor/Compressor.cpp
index 33571606e..0fe139420 100755
--- a/plugins/Compressor/Compressor.cpp
+++ b/plugins/Compressor/Compressor.cpp
@@ -177,7 +177,8 @@ void CompressorEffect::calcRange()
 
 void CompressorEffect::resizeRMS()
 {
-	m_rmsTimeConst = exp(-1.f / (m_compressorControls.m_rmsModel.value() * 0.001f * m_sampleRate));
+	const float rmsValue = m_compressorControls.m_rmsModel.value();
+	m_rmsTimeConst = (rmsValue > 0) ? exp(-1.f / (rmsValue * 0.001f * m_sampleRate)) : 0;
 }
 
 void CompressorEffect::calcLookaheadLength()
diff --git a/plugins/Compressor/CompressorControlDialog.cpp b/plugins/Compressor/CompressorControlDialog.cpp
index 114980a7d..1516456a2 100755
--- a/plugins/Compressor/CompressorControlDialog.cpp
+++ b/plugins/Compressor/CompressorControlDialog.cpp
@@ -497,10 +497,12 @@ void CompressorControlDialog::redrawKnee()
 	float actualRatio = m_controls->m_limiterModel.value() ? 0 : m_controls->m_effect->m_ratioVal;
 
 	// Calculate endpoints for the two straight lines
-	float kneePoint1 = m_controls->m_effect->m_thresholdVal - m_controls->m_effect->m_kneeVal;
-	float kneePoint2X = m_controls->m_effect->m_thresholdVal + m_controls->m_effect->m_kneeVal;
-	float kneePoint2Y = (m_controls->m_effect->m_thresholdVal + (-m_controls->m_effect->m_thresholdVal * (actualRatio * (m_controls->m_effect->m_kneeVal / -m_controls->m_effect->m_thresholdVal))));
-	float ratioPoint = m_controls->m_effect->m_thresholdVal + (-m_controls->m_effect->m_thresholdVal * actualRatio);
+	const float thresholdVal = m_controls->m_effect->m_thresholdVal;
+	const float kneeVal = m_controls->m_effect->m_kneeVal;
+	float kneePoint1 = thresholdVal - kneeVal;
+	float kneePoint2X = thresholdVal + kneeVal;
+	float kneePoint2Y = thresholdVal + kneeVal * actualRatio;
+	float ratioPoint = thresholdVal + (-thresholdVal * actualRatio);
 
 	// Draw two straight lines
 	m_p.drawLine(0, m_kneeWindowSizeY, dbfsToXPoint(kneePoint1), dbfsToYPoint(kneePoint1));
@@ -510,7 +512,7 @@ void CompressorControlDialog::redrawKnee()
 	}
 
 	// Draw knee section
-	if (m_controls->m_effect->m_kneeVal)
+	if (kneeVal)
 	{
 		m_p.setPen(QPen(m_kneeColor2, 3));
 
@@ -522,8 +524,8 @@ void CompressorControlDialog::redrawKnee()
 		{
 			newPoint[0] = linearInterpolate(kneePoint1, kneePoint2X, (i + 1) / (float)COMP_KNEE_LINES);
 
-			const float temp = newPoint[0] - m_controls->m_effect->m_thresholdVal + m_controls->m_effect->m_kneeVal;
-			newPoint[1] = (newPoint[0] + (actualRatio - 1) * temp * temp / (4 * m_controls->m_effect->m_kneeVal));
+			const float temp = newPoint[0] - thresholdVal + kneeVal;
+			newPoint[1] = (newPoint[0] + (actualRatio - 1) * temp * temp / (4 * kneeVal));
 
 			m_p.drawLine(dbfsToXPoint(prevPoint[0]), dbfsToYPoint(prevPoint[1]), dbfsToXPoint(newPoint[0]), dbfsToYPoint(newPoint[1]));
 
@@ -768,4 +770,4 @@ void CompressorControlDialog::resetCompressorView()
 }
 
 
-} // namespace lmms::gui
\ No newline at end of file
+} // namespace lmms::gui