diff --git a/installer/install.iss b/installer/install.iss
index 77dd988acd..38fd0fdf40 100644
--- a/installer/install.iss
+++ b/installer/install.iss
@@ -678,7 +678,7 @@ var
     Caption:String;
     ManualClosingRequired:Boolean;
 begin
-    if (AppDir='') then begin
+    if (AppDir='') or (Pos('/CLOSEAPPLICATIONS',UpperCase(GetCmdTail))>0) or (Pos('/FORCECLOSEAPPLICATIONS',UpperCase(GetCmdTail))>0) then begin
         SetArrayLength(Processes,0);
         Exit;
     end;