diff --git a/samples/apt-cacher-ng.md b/samples/apt-cacher-ng.md
index c0c92bbd38..9af7e02e70 100644
--- a/samples/apt-cacher-ng.md
+++ b/samples/apt-cacher-ng.md
@@ -63,7 +63,7 @@ IP address or FQDN of the host running the `test_apt_cacher_ng`
 container.
 
 1. Add an apt Proxy setting
-   `echo 'Acquire::http { Proxy "http://dockerhost:3142"; };' >> /etc/apt/conf.d/01proxy`
+   `echo 'Acquire::http { Proxy "http://dockerhost:3142"; };' >> /etc/apt/apt.conf.d/01proxy`
 2. Set an environment variable:
    `http_proxy=http://dockerhost:3142/`
 3. Change your `sources.list` entries to start with