diff --git a/src/visual/ScopeCanvas.cpp b/src/visual/ScopeCanvas.cpp
index ad877fe..782bd3a 100644
--- a/src/visual/ScopeCanvas.cpp
+++ b/src/visual/ScopeCanvas.cpp
@@ -59,7 +59,7 @@ void ScopeCanvas::OnKeyDown(wxKeyEvent& event) {
         wxGetApp().setFrequency(freq);
         break;
     case WXK_LEFT:
-        wxGetApp().getFrequency();
+        freq = wxGetApp().getFrequency();
         freq -= 100000;
         wxGetApp().setFrequency(freq);
         break;
diff --git a/src/visual/WaterfallCanvas.cpp b/src/visual/WaterfallCanvas.cpp
index c5ce824..dc8d711 100644
--- a/src/visual/WaterfallCanvas.cpp
+++ b/src/visual/WaterfallCanvas.cpp
@@ -65,7 +65,7 @@ void WaterfallCanvas::OnKeyDown(wxKeyEvent& event) {
         wxGetApp().setFrequency(freq);
         break;
     case WXK_LEFT:
-        wxGetApp().getFrequency();
+        freq = wxGetApp().getFrequency();
         freq -= 100000;
         wxGetApp().setFrequency(freq);
         break;