diff --git a/ui/dragging_scroll_manager.cpp b/ui/dragging_scroll_manager.cpp
index 29aecdf..e9f2f2d 100644
--- a/ui/dragging_scroll_manager.cpp
+++ b/ui/dragging_scroll_manager.cpp
@@ -8,9 +8,14 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/dragging_scroll_manager.h"
 
 #include "base/timer.h"
-#include "ui/widgets/scroll_area.h" // kMaxScrollSpeed.
 
 namespace Ui {
+namespace {
+
+// 37px per 15ms while select-by-drag.
+inline constexpr auto kMaxScrollSpeed = 37;
+
+} // namespace
 
 DraggingScrollManager::DraggingScrollManager() = default;
 
diff --git a/ui/widgets/scroll_area.h b/ui/widgets/scroll_area.h
index 3ab7db1..03692a6 100644
--- a/ui/widgets/scroll_area.h
+++ b/ui/widgets/scroll_area.h
@@ -17,9 +17,6 @@
 
 namespace Ui {
 
-// 37px per 15ms while select-by-drag.
-inline constexpr auto kMaxScrollSpeed = 37;
-
 // Touch flick ignore 3px.
 inline constexpr auto kFingerAccuracyThreshold = 3;