diff --git a/src/frontends/qt4/GuiWorkArea.cpp b/src/frontends/qt4/GuiWorkArea.cpp
index cb9769ab52..36dd253f4e 100644
--- a/src/frontends/qt4/GuiWorkArea.cpp
+++ b/src/frontends/qt4/GuiWorkArea.cpp
@@ -238,7 +238,7 @@ GuiWorkArea::Private::Private(GuiWorkArea * parent)
 : p(parent), buffer_view_(0), lyx_view_(0),
   caret_(0), caret_visible_(false),
   need_resize_(false), preedit_lines_(1),
-  pixel_ratio_(1.0),
+  last_pixel_ratio_(1.0),
   completer_(new GuiCompleter(p, p)), dialog_mode_(false), shell_escape_(false),
   read_only_(false), clean_(true), externally_modified_(false)
 {
@@ -1225,7 +1225,7 @@ void GuiWorkArea::paintEvent(QPaintEvent * ev)
 	// LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 	//	<< " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 
-	if (d->needResize()) {
+	if (d->need_resize_ || pixelRatio() != d->last_pixel_ratio_) {
 		d->resizeBufferView();
 		if (d->caret_visible_) {
 			d->hideCaret();
@@ -1233,6 +1233,8 @@ void GuiWorkArea::paintEvent(QPaintEvent * ev)
 		}
 	}
 
+	d->last_pixel_ratio_ = pixelRatio();
+
 	GuiPainter pain(viewport(), pixelRatio());
 	d->buffer_view_->draw(pain, d->caret_visible_);
 
diff --git a/src/frontends/qt4/GuiWorkArea_Private.h b/src/frontends/qt4/GuiWorkArea_Private.h
index 8be28694cd..ef2bb7e1df 100644
--- a/src/frontends/qt4/GuiWorkArea_Private.h
+++ b/src/frontends/qt4/GuiWorkArea_Private.h
@@ -97,10 +97,6 @@ struct GuiWorkArea::Private
 
 	void paintPreeditText(GuiPainter & pain);
 
-	bool needResize() const {
-		return need_resize_ || p->pixelRatio() != pixel_ratio_;
-	}
-
 	///
 	GuiWorkArea * p;
 	///
@@ -133,7 +129,7 @@ struct GuiWorkArea::Private
 	/// Ratio between physical pixels and device-independent pixels
 	/// We save the last used value to detect changes of the
 	/// current pixel_ratio of the viewport.
-	double pixel_ratio_;
+	double last_pixel_ratio_;
 	///
 	GuiCompleter * completer_;