diff --git a/mkosi.conf b/mkosi.conf
index 9961407a04..b66b7726f1 100644
--- a/mkosi.conf
+++ b/mkosi.conf
@@ -18,8 +18,6 @@ Environment=ASAN_OPTIONS=verify_asan_link_order=false
 @Incremental=yes
 @QemuMem=2G
 @RuntimeSize=8G
-# Make sure we don't trigger systemd-firstboot prompting for the root password.
-Credentials=passwd.plaintext-password.root=
 KernelCommandLineExtra=systemd.crash_shell
                        systemd.log_level=debug
                        systemd.log_ratelimit_kmsg=0
@@ -37,3 +35,4 @@ KernelCommandLineExtra=systemd.crash_shell
                        selinux=0
                        enforcing=0
                        systemd.early_core_pattern=/core
+                       systemd.firstboot=no