diff --git a/ui/platform/linux/ui_utility_linux.h b/ui/platform/linux/ui_utility_linux.h
index c81a814..c6be70e 100644
--- a/ui/platform/linux/ui_utility_linux.h
+++ b/ui/platform/linux/ui_utility_linux.h
@@ -14,9 +14,6 @@ class QPaintEvent;
 namespace Ui {
 namespace Platform {
 
-inline void StartTranslucentPaint(QPainter &p, const QRegion &region) {
-}
-
 inline void InitOnTopPanel(not_null<QWidget*> panel) {
 }
 
diff --git a/ui/platform/mac/ui_utility_mac.mm b/ui/platform/mac/ui_utility_mac.mm
index f6d8b55..c1139d7 100644
--- a/ui/platform/mac/ui_utility_mac.mm
+++ b/ui/platform/mac/ui_utility_mac.mm
@@ -69,14 +69,6 @@ void ReInitOnTopPanel(not_null<QWidget*> panel) {
 	[platformPanel setCollectionBehavior:newBehavior];
 }
 
-void StartTranslucentPaint(QPainter &p, const QRegion &region) {
-	p.setCompositionMode(QPainter::CompositionMode_Source);
-	for (const auto rect : region) {
-		p.fillRect(rect, Qt::transparent);
-	}
-	p.setCompositionMode(QPainter::CompositionMode_SourceOver);
-}
-
 void ShowOverAll(not_null<QWidget*> widget, bool canFocus) {
 	NSWindow *wnd = [reinterpret_cast<NSView*>(widget->winId()) window];
 	[wnd setLevel:NSPopUpMenuWindowLevel];
diff --git a/ui/platform/ui_platform_utility.h b/ui/platform/ui_platform_utility.h
index 32f1760..8b48384 100644
--- a/ui/platform/ui_platform_utility.h
+++ b/ui/platform/ui_platform_utility.h
@@ -18,7 +18,6 @@ namespace Platform {
 [[nodiscard]] bool IsApplicationActive();
 
 [[nodiscard]] bool TranslucentWindowsSupported(QPoint globalPosition);
-void StartTranslucentPaint(QPainter &p, const QRegion &region);
 
 void InitOnTopPanel(not_null<QWidget*> panel);
 void DeInitOnTopPanel(not_null<QWidget*> panel);
diff --git a/ui/platform/win/ui_utility_win.h b/ui/platform/win/ui_utility_win.h
index e517414..f298313 100644
--- a/ui/platform/win/ui_utility_win.h
+++ b/ui/platform/win/ui_utility_win.h
@@ -29,9 +29,6 @@ inline void DeInitOnTopPanel(not_null<QWidget*> panel) {
 inline void ReInitOnTopPanel(not_null<QWidget*> panel) {
 }
 
-inline void StartTranslucentPaint(QPainter &p, const QRegion &region) {
-}
-
 inline void ShowOverAll(not_null<QWidget*> widget, bool canFocus) {
 }