diff --git a/ui/platform/linux/ui_utility_linux.cpp b/ui/platform/linux/ui_utility_linux.cpp
index bfcc482..b61e47b 100644
--- a/ui/platform/linux/ui_utility_linux.cpp
+++ b/ui/platform/linux/ui_utility_linux.cpp
@@ -184,6 +184,17 @@ bool TranslucentWindowsSupported(QPoint globalPosition) {
 void IgnoreAllActivation(not_null<QWidget*> widget) {
 }
 
+void ClearTransientParent(not_null<QWidget*> widget) {
+#ifndef DESKTOP_APP_DISABLE_X11_INTEGRATION
+	if (::Platform::IsX11()) {
+		xcb_delete_property(
+			base::Platform::XCB::GetConnectionFromQt(),
+			widget->windowHandle()->winId(),
+			XCB_ATOM_WM_TRANSIENT_FOR);
+	}
+#endif // !DESKTOP_APP_DISABLE_X11_INTEGRATION
+}
+
 bool WindowExtentsSupported() {
 #ifdef DESKTOP_APP_QT_PATCHED
 	if (::Platform::IsWayland()) {
diff --git a/ui/platform/mac/ui_utility_mac.h b/ui/platform/mac/ui_utility_mac.h
index 97f3c11..070f3ee 100644
--- a/ui/platform/mac/ui_utility_mac.h
+++ b/ui/platform/mac/ui_utility_mac.h
@@ -20,6 +20,9 @@ inline bool TranslucentWindowsSupported(QPoint globalPosition) {
 inline void UpdateOverlayed(not_null<QWidget*> widget) {
 }
 
+inline void ClearTransientParent(not_null<QWidget*> widget) {
+}
+
 inline constexpr bool UseMainQueueGeneric() {
 	return ::Platform::IsMacStoreBuild();
 }
diff --git a/ui/platform/ui_platform_utility.h b/ui/platform/ui_platform_utility.h
index 40dcdff..3360418 100644
--- a/ui/platform/ui_platform_utility.h
+++ b/ui/platform/ui_platform_utility.h
@@ -28,6 +28,7 @@ void UpdateOverlayed(not_null<QWidget*> widget);
 void ShowOverAll(not_null<QWidget*> widget, bool canFocus = true);
 void BringToBack(not_null<QWidget*> widget);
 void IgnoreAllActivation(not_null<QWidget*> widget);
+void ClearTransientParent(not_null<QWidget*> widget);
 
 [[nodiscard]] constexpr bool UseMainQueueGeneric();
 void DrainMainQueue(); // Needed only if UseMainQueueGeneric() is false.
diff --git a/ui/platform/win/ui_utility_win.h b/ui/platform/win/ui_utility_win.h
index d836b49..e517414 100644
--- a/ui/platform/win/ui_utility_win.h
+++ b/ui/platform/win/ui_utility_win.h
@@ -38,6 +38,9 @@ inline void ShowOverAll(not_null<QWidget*> widget, bool canFocus) {
 inline void BringToBack(not_null<QWidget*> widget) {
 }
 
+inline void ClearTransientParent(not_null<QWidget*> widget) {
+}
+
 inline constexpr bool UseMainQueueGeneric() {
 	return true;
 }