diff --git a/lcl/interfaces/qt/qtobject.inc b/lcl/interfaces/qt/qtobject.inc
index b5eb481a79..6e5704b714 100644
--- a/lcl/interfaces/qt/qtobject.inc
+++ b/lcl/interfaces/qt/qtobject.inc
@@ -615,6 +615,8 @@ begin
      {$ifdef MSWINDOWS} LCL_CAPABILITY_YES {$else} LCL_CAPABILITY_NO {$endif};
      lcNeedMininimizeAppWithMainForm: Result :=
      {$ifdef HASX11} LCL_CAPABILITY_YES {$else} LCL_CAPABILITY_NO {$endif};
+     {when issue #20475 is fixed, then set this to LCL_CAPABILITY_YES}
+     lcReceivesLMClearCutCopyPasteReliably: Result := LCL_CAPABILITY_NO;
   else
     Result := inherited GetLCLCapability(ACapability);
   end;