diff --git a/src/controls/QskInputPanel.cpp b/src/controls/QskInputPanel.cpp
index a607e2ea..e1d0d324 100644
--- a/src/controls/QskInputPanel.cpp
+++ b/src/controls/QskInputPanel.cpp
@@ -707,7 +707,7 @@ void QskInputPanel::timerEvent( QTimerEvent* e )
     }
 }
 
-QskInputPanel::KeyData& QskInputPanel::keyDataAt( int keyIndex )
+QskInputPanel::KeyData& QskInputPanel::keyDataAt( int keyIndex ) const
 {
     const auto row = keyIndex / KeyCount;
     const auto col = keyIndex % KeyCount;
@@ -912,7 +912,6 @@ void QskInputPanel::updateLocale( const QLocale& locale )
         default:
             qWarning() << "QskInputPanel: unsupported locale:" << locale;
             m_data->currentLayout = &qskInputPanelLayouts.en_US;
-
     }
 
     Q_EMIT displayLanguageNameChanged();
diff --git a/src/controls/QskInputPanel.h b/src/controls/QskInputPanel.h
index db262b4b..963e08a2 100644
--- a/src/controls/QskInputPanel.h
+++ b/src/controls/QskInputPanel.h
@@ -92,7 +92,7 @@ protected:
     virtual void timerEvent( QTimerEvent* ) override;
 
 private:
-    KeyData& keyDataAt( int );
+    KeyData& keyDataAt( int ) const;
 
     void handleKey( int );
     void compose( Qt::Key );