diff --git a/pkgs/development/python-modules/backports_lzma/default.nix b/pkgs/development/python-modules/backports_lzma/default.nix
index c650076d4c00..64fcc2c0d5d4 100644
--- a/pkgs/development/python-modules/backports_lzma/default.nix
+++ b/pkgs/development/python-modules/backports_lzma/default.nix
@@ -20,9 +20,8 @@ if !(pythonOlder "3.3") then null else buildPythonPackage rec {
 
   buildInputs = [ lzma ];
 
-  # Needs the compiled module in $out
   checkPhase = ''
-    PYTHONPATH=$out/${python.sitePackages}:$PYTHONPATH ${python.interpreter} -m unittest discover -s test
+    ${python.interpreter} test/test_lzma.py
   '';
 
   meta = {
@@ -30,4 +29,4 @@ if !(pythonOlder "3.3") then null else buildPythonPackage rec {
     homepage = https://github.com/peterjc/backports.lzma;
     license = lib.licenses.bsd3;
   };
-}
\ No newline at end of file
+}