diff --git a/etc/apt/preferences.d/limit-unstable b/etc/apt/preferences.d/limit-unstable
index 0aef032c..a7b8a225 100644
--- a/etc/apt/preferences.d/limit-unstable
+++ b/etc/apt/preferences.d/limit-unstable
@@ -4,3 +4,7 @@
 Package: *
 Pin: release a=unstable
 Pin-Priority: 90
+
+Package: *
+Pin: release a=unstable-debug
+Pin-Priority: 90