diff --git a/nixos/modules/services/databases/openldap.nix b/nixos/modules/services/databases/openldap.nix
index 5bf57a1bf9c..809f61cfa81 100644
--- a/nixos/modules/services/databases/openldap.nix
+++ b/nixos/modules/services/databases/openldap.nix
@@ -259,6 +259,8 @@ in
           ${openldap.out}/bin/slapadd ${configOpts} -l ${dataFile}
         ''}
         chown -R "${cfg.user}:${cfg.group}" "${cfg.dataDir}"
+
+        ${openldap}/bin/slaptest ${configOpts}
       '';
       serviceConfig.ExecStart =
         "${openldap.out}/libexec/slapd -d '${cfg.logLevel}' " +