diff --git a/src/Gui/Window.cpp b/src/Gui/Window.cpp
index 506f0dba6e..dd19ce1f7b 100644
--- a/src/Gui/Window.cpp
+++ b/src/Gui/Window.cpp
@@ -44,13 +44,13 @@ using namespace Gui;
 
 WindowParameter::WindowParameter(const char *name)
 {
-  // not allowed to use a Window without a name, see the constructor of a DockWindow or a other QT Widget
-  assert(name);
-  //printf("Instanceate:%s\n",name);
+    // not allowed to use a Window without a name, see the constructor
+    // of a DockWindow or a other QT Widget
+    assert(name);
 
-  // if string is empty do not create group
-  if ( strcmp(name, "") != 0 )
-    _handle = getDefaultParameter()->GetGroup( name );
+    // if string is empty do not create group
+    if ( strcmp(name, "") != 0 )
+      _handle = getDefaultParameter()->GetGroup( name );
 }
 
 WindowParameter::~WindowParameter()
@@ -87,13 +87,13 @@ bool WindowParameter::setGroupName(const char* name)
 
 void WindowParameter::OnChange(Base::Subject<const char*> &rCaller, const char * sReason)
 {
-  Q_UNUSED(rCaller);
-  Q_UNUSED(sReason);
+    Q_UNUSED(rCaller);
+    Q_UNUSED(sReason);
 }
 
 ParameterGrp::handle  WindowParameter::getWindowParameter()
 {
-  return _handle;
+    return _handle;
 }
 
 /**
@@ -102,5 +102,5 @@ ParameterGrp::handle  WindowParameter::getWindowParameter()
  */
 ParameterGrp::handle  WindowParameter::getDefaultParameter()
 {
-  return App::GetApplication().GetUserParameter().GetGroup("BaseApp")->GetGroup("Preferences");
+    return App::GetApplication().GetUserParameter().GetGroup("BaseApp")->GetGroup("Preferences");
 }
diff --git a/src/Gui/Window.h b/src/Gui/Window.h
index 7375bb3f25..179c7a88d8 100644
--- a/src/Gui/Window.h
+++ b/src/Gui/Window.h
@@ -35,36 +35,36 @@ namespace Gui {
 class GuiExport WindowParameter : public ParameterGrp::ObserverType
 {
 public:
-  WindowParameter(const char *name);
-  ~WindowParameter() override;
+    WindowParameter(const char *name);
+    ~WindowParameter() override;
 
-  void OnChange(Base::Subject<const char*> &rCaller, const char * sReason) override;
+    void OnChange(Base::Subject<const char*> &rCaller, const char * sReason) override;
 
-  /// get the parameters
-  static ParameterGrp::handle getDefaultParameter();
-  /// return the parameter group of this window
-  ParameterGrp::handle getWindowParameter();
+    /// get the parameters
+    static ParameterGrp::handle getDefaultParameter();
+    /// return the parameter group of this window
+    ParameterGrp::handle getWindowParameter();
 
 protected:
-  bool setGroupName( const char* name );
-  /// connect slot to ParameterManager signal
-  template<typename S, typename T>
-  void setSlotParamChanged(S slot, T* obsPtr);
+    bool setGroupName( const char* name );
+    /// connect slot to ParameterManager signal
+    template<typename S, typename T>
+    void setSlotParamChanged(S slot, T* obsPtr);
 
 private:
-  ParameterGrp::handle _handle;
-  boost::signals2::connection connParamChanged;
+    ParameterGrp::handle _handle;
+    boost::signals2::connection connParamChanged;
 };
 
 
 template<typename S, typename T>
 inline void WindowParameter::setSlotParamChanged(S slot, T* obsPtr)
 {
-  namespace bp = std::placeholders;
-  if (_handle->Manager()) {
-      connParamChanged = _handle->Manager()->signalParamChanged.connect(
-          std::bind(slot, obsPtr, bp::_1, bp::_2, bp::_3, bp::_4));
-  }
+    namespace bp = std::placeholders;
+    if (_handle->Manager()) {
+        connParamChanged = _handle->Manager()->signalParamChanged.connect(
+            std::bind(slot, obsPtr, bp::_1, bp::_2, bp::_3, bp::_4));
+    }
 }
 
 } // namespace Gui