diff --git a/nixos/modules/services/web-apps/nextcloud.nix b/nixos/modules/services/web-apps/nextcloud.nix
index 6f92c0ca5e58..254eccf048b0 100644
--- a/nixos/modules/services/web-apps/nextcloud.nix
+++ b/nixos/modules/services/web-apps/nextcloud.nix
@@ -1166,7 +1166,7 @@ in
               imap0 (i: v: ''
                 ${lib.getExe occ} config:system:set trusted_domains \
                   ${toString i} --value="${toString v}"
-              '') ([ cfg.hostName ] ++ cfg.settings.trusted_domains)
+              '') (lib.unique ([ cfg.hostName ] ++ cfg.settings.trusted_domains))
             );
 
           in