diff --git a/fish/functions/mkosi_bld.fish b/fish/functions/mkosi_bld.fish
index 6ca9ac80..f0ea9d85 100644
--- a/fish/functions/mkosi_bld.fish
+++ b/fish/functions/mkosi_bld.fish
@@ -52,10 +52,10 @@ function mkosi_bld -d "Build a distribution using mkosi"
     switch (basename $directory)
         case dev-arch
             set cache_dir pacman
+        case dev-debian pgo-llvm-builder
+            set cache_dir apt
         case dev-fedora
             set cache_dir dnf
-        case pgo-llvm-builder
-            set cache_dir apt
     end
 
     sudo (command -v mkosi) \
diff --git a/mkosi/dev-debian/mkosi.conf b/mkosi/dev-debian/mkosi.conf
new file mode 100644
index 00000000..a51cc7d4
--- /dev/null
+++ b/mkosi/dev-debian/mkosi.conf
@@ -0,0 +1,16 @@
+[Build]
+WithNetwork=true
+
+[Content]
+Bootable=false
+# base
+Packages=build-essential
+
+[Distribution]
+Distribution=debian
+Release=unstable
+
+[Output]
+Format=directory
+ImageId=dev-debian
+OutputDirectory=/var/lib/machines