diff --git a/src/modules/keyboard/keyboardwidget/keyboardpreview.cpp b/src/modules/keyboard/keyboardwidget/keyboardpreview.cpp
index 72d6c0616..e29673d88 100644
--- a/src/modules/keyboard/keyboardwidget/keyboardpreview.cpp
+++ b/src/modules/keyboard/keyboardwidget/keyboardpreview.cpp
@@ -22,8 +22,11 @@
 
 #include "keyboardpreview.h"
 
-KeyBoardPreview::KeyBoardPreview(QWidget* parent) :
-    QWidget(parent)
+KeyBoardPreview::KeyBoardPreview( QWidget* parent )
+    : QWidget( parent )
+    , space( 0 )
+    , usable_width( 0 )
+    , key_w( 0 )
 {
     setMinimumSize(700, 191);
 
diff --git a/src/modules/keyboard/keyboardwidget/keyboardpreview.h b/src/modules/keyboard/keyboardwidget/keyboardpreview.h
index 02714c2ad..2bd6275f6 100644
--- a/src/modules/keyboard/keyboardwidget/keyboardpreview.h
+++ b/src/modules/keyboard/keyboardwidget/keyboardpreview.h
@@ -40,7 +40,7 @@ class KeyBoardPreview : public QWidget
 {
     Q_OBJECT
 public:
-    explicit KeyBoardPreview(QWidget* parent = 0);
+    explicit KeyBoardPreview( QWidget* parent = nullptr );
     
     void setLayout(QString layout);
     void setVariant(QString variant);