includepdf and tableofcontents without numbering

I try to include an entire pdf file with pdfpages but I will not use numbering in the table of contents. Here is a MWE, which illustrates the problem.

\documentclass[a4paper]{scrreprt}
\usepackage{pdfpages}
\setcounter{tocdepth}{5}
\setcounter{secnumdepth}{5}
\begin{document}
\tableofcontents
Only a test