diff --git a/.mkosi/mkosi.opensuse b/.mkosi/mkosi.opensuse
index 57d13b2740..79fda17ac7 100644
--- a/.mkosi/mkosi.opensuse
+++ b/.mkosi/mkosi.opensuse
@@ -52,6 +52,7 @@ BuildPackages=
         zlib-devel
 # to satisfy tests
         acl
+        diffutils
         glibc-locale
         system-group-obsolete
         system-user-bin