diff --git a/src/AppFrame.cpp b/src/AppFrame.cpp
index 5e296b4..bc298ae 100644
--- a/src/AppFrame.cpp
+++ b/src/AppFrame.cpp
@@ -517,7 +517,9 @@ void AppFrame::OnIdle(wxIdleEvent& event) {
         }
 
         if (wxGetApp().getFrequency() != waterfallCanvas->getCenterFrequency()) {
-            spectrumCanvas->setCenterFrequency(wxGetApp().getFrequency());
+            if (!spectrumCanvas->getMouseTracker()->mouseDown()) {
+                spectrumCanvas->setCenterFrequency(wxGetApp().getFrequency());
+            }
             waterfallCanvas->setCenterFrequency(wxGetApp().getFrequency());
             demodWaterfallCanvas->setCenterFrequency(wxGetApp().getFrequency());
             demodSpectrumCanvas->setCenterFrequency(wxGetApp().getFrequency());
diff --git a/src/visual/InteractiveCanvas.cpp b/src/visual/InteractiveCanvas.cpp
index 226d8f5..cdd5903 100644
--- a/src/visual/InteractiveCanvas.cpp
+++ b/src/visual/InteractiveCanvas.cpp
@@ -73,6 +73,10 @@ unsigned int InteractiveCanvas::getBandwidth() {
     }
 }
 
+MouseTracker *InteractiveCanvas::getMouseTracker() {
+    return &mouseTracker;
+}
+
 void InteractiveCanvas::OnKeyUp(wxKeyEvent& event) {
     shiftDown = event.ShiftDown();
     altDown = event.AltDown();
diff --git a/src/visual/InteractiveCanvas.h b/src/visual/InteractiveCanvas.h
index 6699d49..cb94a4f 100644
--- a/src/visual/InteractiveCanvas.h
+++ b/src/visual/InteractiveCanvas.h
@@ -22,6 +22,8 @@ public:
     void setBandwidth(unsigned int bandwidth_in);
     unsigned int getBandwidth();
 
+    MouseTracker *getMouseTracker();
+
 protected:
     void OnKeyDown(wxKeyEvent& event);
     void OnKeyUp(wxKeyEvent& event);