diff --git a/nixos/modules/services/misc/octoprint.nix b/nixos/modules/services/misc/octoprint.nix
index c926d889b37a..7129ac69527f 100644
--- a/nixos/modules/services/misc/octoprint.nix
+++ b/nixos/modules/services/misc/octoprint.nix
@@ -122,6 +122,9 @@ in
         ExecStart = "${pluginsEnv}/bin/octoprint serve -b ${cfg.stateDir}";
         User = cfg.user;
         Group = cfg.group;
+        SupplementaryGroups = [
+          "dialout"
+        ];
       };
     };