diff --git a/build/windows/nagstamon.iss b/build/windows/nagstamon.iss
index ba16ace14..d3b64be8a 100644
--- a/build/windows/nagstamon.iss
+++ b/build/windows/nagstamon.iss
@@ -39,5 +39,5 @@ procedure KillRunningNagstamon();
 var
   ReturnCode: Integer;
 begin
-    Exec(ExpandConstant('taskkill.exe'), '/f /im nagstamon.exe', '', SW_HIDE, ewWaitUntilTerminated, ReturnCode);
+    Exec(ExpandConstant('taskkill.exe'), '/f /t /im nagstamon.exe', '', SW_HIDE, ewWaitUntilIdle, ReturnCode);
 end;
\ No newline at end of file