diff --git a/lcl/interfaces/qt6/qt62.pas b/lcl/interfaces/qt6/qt62.pas
index b88f3e338c..b4f8767869 100644
--- a/lcl/interfaces/qt6/qt62.pas
+++ b/lcl/interfaces/qt6/qt62.pas
@@ -5554,6 +5554,10 @@ function QGuiApplication_isSavingSession(handle: QGuiApplicationH): Boolean; cde
 function QGuiApplication_applicationState(): QtApplicationState; cdecl; external Qt6PasLib name 'QGuiApplication_applicationState';
 function QGuiApplication_highDpiScaleFactorRoundingPolicy(): QtHighDpiScaleFactorRoundingPolicy; cdecl; external Qt6PasLib name 'QGuiApplication_highDpiScaleFactorRoundingPolicy';
 procedure QGuiApplication_setHighDpiScaleFactorRoundingPolicy(const policy: QtHighDpiScaleFactorRoundingPolicy); cdecl; external Qt6PasLib name 'QGuiApplication_setHighDpiScaleFactorRoundingPolicy';
+{$IFDEF BINUX}
+function QGuiApplication_x11Display(handle: QGuiApplicationH): Pointer; cdecl; external Qt6PasLib name 'QGuiApplication_x11Display';
+function QGuiApplication_xcbConnection(handle: QGuiApplicationH): Pointer; cdecl; external Qt6PasLib name 'QGuiApplication_xcbConnection';
+{$ENDIF}
 
 
 type
diff --git a/lcl/interfaces/qt6/qtobject.inc b/lcl/interfaces/qt6/qtobject.inc
index 21fa8ccc8a..77aaa49767 100644
--- a/lcl/interfaces/qt6/qtobject.inc
+++ b/lcl/interfaces/qt6/qtobject.inc
@@ -546,7 +546,7 @@ end;
 function TQtWidgetSet.x11Display: PDisplay;
 begin
   if FX11Display = nil then
-    FX11Display := XOpenDisplay(nil);
+    FX11Display := PDisplay(QGuiApplication_x11Display(QGuiApplicationH(QCoreApplication_instance())));
   Result := FX11Display;
 end;
 {$ENDIF}