diff --git a/Telegram/SourceFiles/intro/intro_step.cpp b/Telegram/SourceFiles/intro/intro_step.cpp
index 7606c30efd..83a62e99d3 100644
--- a/Telegram/SourceFiles/intro/intro_step.cpp
+++ b/Telegram/SourceFiles/intro/intro_step.cpp
@@ -75,15 +75,16 @@ Step::Step(
 			? st::introCoverDescription
 			: st::introDescription)) {
 	hide();
-	subscribe(Window::Theme::Background(), [this](
-			const Window::Theme::BackgroundUpdate &update) {
-		if (update.paletteChanged()) {
-			if (!_coverMask.isNull()) {
-				_coverMask = QPixmap();
-				prepareCoverMask();
-			}
+	base::ObservableViewer(
+		*Window::Theme::Background()
+	) | rpl::filter([](const Window::Theme::BackgroundUpdate &update) {
+		return update.paletteChanged();
+	}) | rpl::start_with_next([=] {
+		if (!_coverMask.isNull()) {
+			_coverMask = QPixmap();
+			prepareCoverMask();
 		}
-	});
+	}, lifetime());
 
 	_errorText.value(
 	) | rpl::start_with_next([=](const QString &text) {
diff --git a/Telegram/SourceFiles/intro/intro_step.h b/Telegram/SourceFiles/intro/intro_step.h
index b98349a449..4a590a93ec 100644
--- a/Telegram/SourceFiles/intro/intro_step.h
+++ b/Telegram/SourceFiles/intro/intro_step.h
@@ -31,7 +31,7 @@ struct Data;
 enum class StackAction;
 enum class Animate;
 
-class Step : public Ui::RpWidget, protected base::Subscriber {
+class Step : public Ui::RpWidget {
 public:
 	Step(
 		QWidget *parent,