diff --git a/etc/apt/preferences.d/stable b/etc/apt/preferences.d/stable.donotuse
similarity index 100%
rename from etc/apt/preferences.d/stable
rename to etc/apt/preferences.d/stable.donotuse
diff --git a/etc/apt/preferences.d/unstable b/etc/apt/preferences.d/unstable
index 7264e8eb..ec7eb7dd 100644
--- a/etc/apt/preferences.d/unstable
+++ b/etc/apt/preferences.d/unstable
@@ -5,6 +5,10 @@ Package: *
 Pin: release a=testing
 Pin-Priority: 900
 
+Package: *
+Pin: release a=testing-debug
+Pin-Priority: 900
+
 Package: *
 Pin: release o=Debian
 Pin-Priority: -10