diff --git a/pkgs/applications/misc/pure-maps/default.nix b/pkgs/applications/misc/pure-maps/default.nix
index 4da7653baac7..ecc5c97a7254 100644
--- a/pkgs/applications/misc/pure-maps/default.nix
+++ b/pkgs/applications/misc/pure-maps/default.nix
@@ -50,7 +50,7 @@ mkDerivation rec {
   pythonPath = with python3.pkgs; [ gpxpy ];
 
   preInstall = ''
-    buildPythonPath "$pythonPath"
+    buildPythonPath "''${pythonPath[*]}"
     qtWrapperArgs+=(--prefix PYTHONPATH : "$program_PYTHONPATH")
   '';