diff --git a/mkosi.images/system/mkosi.conf b/mkosi.images/system/mkosi.conf
index 303af4acb1..ed09d841b8 100644
--- a/mkosi.images/system/mkosi.conf
+++ b/mkosi.images/system/mkosi.conf
@@ -40,6 +40,7 @@ Packages=
         udev
         util-linux
         valgrind
+        which
         wireguard-tools
         xfsprogs
         zsh