diff --git a/Telegram/SourceFiles/boxes/calendar_box.cpp b/Telegram/SourceFiles/boxes/calendar_box.cpp
index 48cfdd794..a9d5158f7 100644
--- a/Telegram/SourceFiles/boxes/calendar_box.cpp
+++ b/Telegram/SourceFiles/boxes/calendar_box.cpp
@@ -599,4 +599,19 @@ void CalendarBox::keyPressEvent(QKeyEvent *e) {
 	}
 }
 
+void CalendarBox::wheelEvent(QWheelEvent *e) {
+	// Only a mouse wheel is accepted.
+	constexpr auto step = static_cast<int>(QWheelEvent::DefaultDeltasPerStep);
+	const auto delta = e->angleDelta().y();
+	if (std::abs(delta) != step) {
+		return;
+	}
+
+	if (delta < 0) {
+		goPreviousMonth();
+	} else {
+		goNextMonth();
+	}
+}
+
 CalendarBox::~CalendarBox() = default;
diff --git a/Telegram/SourceFiles/boxes/calendar_box.h b/Telegram/SourceFiles/boxes/calendar_box.h
index 066d0425f..391f25bed 100644
--- a/Telegram/SourceFiles/boxes/calendar_box.h
+++ b/Telegram/SourceFiles/boxes/calendar_box.h
@@ -46,6 +46,7 @@ protected:
 
 	void keyPressEvent(QKeyEvent *e) override;
 	void resizeEvent(QResizeEvent *e) override;
+	void wheelEvent(QWheelEvent *e) override;
 
 private:
 	void monthChanged(QDate month);