diff --git a/spectrogramplot.cpp b/spectrogramplot.cpp
index 8ec4396..5f50c20 100644
--- a/spectrogramplot.cpp
+++ b/spectrogramplot.cpp
@@ -31,7 +31,7 @@
 #include "util.h"
 
 
-SpectrogramPlot::SpectrogramPlot(std::shared_ptr<SampleSource<std::complex<float>>> src) : Plot(src), inputSource(src), fftSize(512), tuner(this)
+SpectrogramPlot::SpectrogramPlot(std::shared_ptr<SampleSource<std::complex<float>>> src) : Plot(src), inputSource(src), fftSize(512), tuner(fftSize, this)
 {
     setFFTSize(fftSize);
     zoomLevel = 1;
@@ -284,8 +284,11 @@ void SpectrogramPlot::setFFTSize(int size)
     }
 
     setHeight(fftSize);
-    tuner.setDeviation( tuner.deviation() * sizeScale );
-    tuner.setCentre( tuner.centre() * sizeScale );
+    auto dev = tuner.deviation();
+    auto centre = tuner.centre();
+    tuner.setHeight(fftSize);
+    tuner.setDeviation( dev * sizeScale );
+    tuner.setCentre( centre * sizeScale );
 }
 
 void SpectrogramPlot::setPowerMax(int power)
diff --git a/tuner.cpp b/tuner.cpp
index 90880e2..e278d2c 100644
--- a/tuner.cpp
+++ b/tuner.cpp
@@ -20,7 +20,7 @@
 #include <cstdlib>
 #include "tuner.h"
 
-Tuner::Tuner(QObject * parent) : QObject::QObject(parent)
+Tuner::Tuner(int height, QObject * parent) : height(height), QObject::QObject(parent)
 {
     minCursor = new Cursor(Qt::Horizontal, Qt::SizeVerCursor, this);
     cfCursor = new Cursor(Qt::Horizontal, Qt::SizeAllCursor, this);
@@ -102,6 +102,11 @@ void Tuner::setDeviation(int dev)
     updateCursors();
 }
 
+void Tuner::setHeight(int height)
+{
+    this->height = height;
+}
+
 void Tuner::updateCursors()
 {
     minCursor->setPos(cfCursor->pos() - _deviation);
diff --git a/tuner.h b/tuner.h
index 5ed9254..0a5286b 100644
--- a/tuner.h
+++ b/tuner.h
@@ -31,25 +31,27 @@ class Tuner : public QObject
     Q_OBJECT
 
 public:
-    Tuner(QObject * parent);
+    Tuner(int height, QObject * parent);
     int centre();
     int deviation();
     bool mouseEvent(QEvent::Type, QMouseEvent event);
     void paintFront(QPainter &painter, QRect &rect, range_t<off_t> sampleRange);
     void setCentre(int centre);
     void setDeviation(int dev);
+    void setHeight(int height);
 
 public slots:
-	void cursorMoved();
+    void cursorMoved();
 
 signals:
-	void tunerMoved();
+    void tunerMoved();
 
 private:
-	void updateCursors();
+    void updateCursors();
 
-	Cursor *minCursor;
-	Cursor *cfCursor;
-	Cursor *maxCursor;
-	int _deviation;
+    Cursor *minCursor;
+    Cursor *cfCursor;
+    Cursor *maxCursor;
+    int _deviation;
+    int height;
 };