diff --git a/pkgs/development/python-modules/ua-parser/default.nix b/pkgs/development/python-modules/ua-parser/default.nix
index e88076389734..d2fc2461a446 100644
--- a/pkgs/development/python-modules/ua-parser/default.nix
+++ b/pkgs/development/python-modules/ua-parser/default.nix
@@ -1,4 +1,4 @@
-{ lib, buildPythonPackage, fetchPypi, pyyaml }:
+{ lib, buildPythonPackage, fetchPypi }:
 
 buildPythonPackage rec {
   pname = "ua-parser";
@@ -9,10 +9,15 @@ buildPythonPackage rec {
     sha256 = "0csh307zfz666kkk5idrw3crj1x8q8vsqgwqil0r1n1hs4p7ica7";
   };
 
-  propagatedBuildInputs = [ pyyaml ];
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace '"pyyaml"' ""
+  '';
 
   doCheck = false; # requires files from uap-core
 
+  pythonImportsCheck = [ "ua_parser" ];
+
   meta = with lib; {
     description = "A python implementation of the UA Parser";
     homepage = "https://github.com/ua-parser/uap-python";