diff --git a/pkgs/by-name/gp/gpsd/package.nix b/pkgs/by-name/gp/gpsd/package.nix
index 4b9ce26531fc..da79ea9da304 100644
--- a/pkgs/by-name/gp/gpsd/package.nix
+++ b/pkgs/by-name/gp/gpsd/package.nix
@@ -74,7 +74,10 @@ stdenv.mkDerivation rec {
     pango
   ];
 
-  pythonPath = lib.optionals guiSupport [
+  pythonPath = [
+    python3Packages.pyserial
+  ]
+  ++ lib.optionals guiSupport [
     python3Packages.pygobject3
     python3Packages.pycairo
   ];