diff --git a/kdbg/README.md b/kdbg/README.md
index 85516ad4f7c4f4b23b043751098ad5a2e280e822..6d62d3170c64ba6bfba4c001e1a9da6b83b93440 100644
--- a/kdbg/README.md
+++ b/kdbg/README.md
@@ -34,7 +34,7 @@ If you specified an install prefix during the cmake step above (with `-DCMAKE_IN
 
 ```
 cp prefix.sh install_dir/kdbg
-source install_dir/kdbg
+source install_dir/kdbg/prefix.sh
 install_dir/kdg
 ```