diff --git a/preferences.d/prefer-stretch.pref b/preferences.d/prefer-stretch.pref
new file mode 100644
index 0000000..4458dba
--- /dev/null
+++ b/preferences.d/prefer-stretch.pref
@@ -0,0 +1,29 @@
+# target-release priorities should be >= 990 (and < 1000) apart from backports
+
+# Debian 9
+Package: *
+Pin: release o=Debian,n=stretch*
+Pin-Priority: 990
+
+Package: *
+Pin: release o=Debian Backports,n=stretch-backports
+Pin-Priority: 980
+
+# Debian 10
+Package: *
+Pin: release o=Debian,n=buster*
+Pin-Priority: 890
+
+Package: *
+Pin: release o=Debian Backports,n=buster-backports
+Pin-Priority: 880
+
+# Debian unstable
+Package: *
+Pin: release o=Debian,n=sid*
+Pin-Priority: 300
+
+# Debian others (experimental, ...)
+Package: *
+Pin: release o=Debian
+Pin-Priority: -1
diff --git a/sources.list.d/stretch-src.list b/sources.list.d/stretch-src.list
new file mode 100644
index 0000000..04baae7
--- /dev/null
+++ b/sources.list.d/stretch-src.list
@@ -0,0 +1,5 @@
+deb-src  http://ftp.de.debian.org./debian   stretch                  main contrib non-free
+deb-src  http://ftp.de.debian.org./debian   stretch-updates          main contrib non-free
+deb-src  http://ftp.de.debian.org./debian   stretch-proposed-updates main contrib non-free
+deb-src  http://security.debian.org./       stretch/updates          main contrib non-free
+deb-src  http://ftp.de.debian.org./debian   stretch-backports        main contrib non-free
diff --git a/sources.list.d/stretch.list b/sources.list.d/stretch.list
new file mode 100644
index 0000000..767308e
--- /dev/null
+++ b/sources.list.d/stretch.list
@@ -0,0 +1,5 @@
+deb      http://ftp.de.debian.org./debian   stretch                  main contrib non-free
+deb      http://ftp.de.debian.org./debian   stretch-updates          main contrib non-free
+deb      http://ftp.de.debian.org./debian   stretch-proposed-updates main contrib non-free
+deb      http://security.debian.org./       stretch/updates          main contrib non-free
+deb      http://ftp.de.debian.org./debian   stretch-backports        main contrib non-free