diff --git a/.mkosi/mkosi.arch b/.mkosi/mkosi.arch
index 0561fece11f..ce0c1ae38ef 100644
--- a/.mkosi/mkosi.arch
+++ b/.mkosi/mkosi.arch
@@ -23,6 +23,7 @@ BuildPackages=
         cryptsetup
         curl
         dbus
+        diffutils
         docbook-xsl
         elfutils
         gcc