diff --git a/hosts/pulsebert/default.nix b/hosts/pulsebert/default.nix
index 65b337ac..a5422e13 100644
--- a/hosts/pulsebert/default.nix
+++ b/hosts/pulsebert/default.nix
@@ -85,9 +85,12 @@ in
 
   users.users = {
     # Allow access to printer serial port and GPIO
-    "${config.services.octoprint.user}".extraGroups = [ "dialout" "gpio" ];
+    "${config.services.octoprint.user}".extraGroups = [ "dialout" ];
     # Allow gpio group to access GPIO devices
-    gpio = { };
+    gpio = {
+      isNormalUser = true;
+      group = "gpio";
+    };
   };
 
   services = {
diff --git a/overlay/readsb.nix b/overlay/readsb.nix
index df512686..15bb96a9 100644
--- a/overlay/readsb.nix
+++ b/overlay/readsb.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
 
   src = fetchFromGitHub {
     owner = "Mictronics";
-    repo = name;
+    repo = pname;
     # branch "dev" as of 2021-12-10
     rev = "b6c1bebc77d80a9366e31c13c73eea95e7a9296a";
     sha256 = "0vg37cngbvahwb8wc6j5i605d8fn4ck0szy13xzw5b3q61aqvaqv";