diff --git a/pkgs/development/python-modules/whoosh/default.nix b/pkgs/development/python-modules/whoosh/default.nix
index 246b3c65fc5b..a7b34cf9b364 100644
--- a/pkgs/development/python-modules/whoosh/default.nix
+++ b/pkgs/development/python-modules/whoosh/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, buildPythonPackage, fetchPypi, pytest_3 }:
+{ stdenv, buildPythonPackage, fetchPypi, pytest }:
 
 buildPythonPackage rec {
   pname = "Whoosh";
@@ -8,11 +8,12 @@ buildPythonPackage rec {
     sha256 = "10qsqdjpbc85fykc1vgcs8xwbgn4l2l52c8d83xf1q59pwyn79bw";
   };
 
-  checkInputs = [ pytest_3 ];
+  checkInputs = [ pytest ];
 
   # Wrong encoding
   postPatch = ''
     rm tests/test_reading.py
+    substituteInPlace setup.cfg --replace "[pytest]" "[tool:pytest]"
   '';
   checkPhase =  ''
     # FIXME: test_minimize_dfa fails on python 3.6
@@ -25,6 +26,5 @@ checking library.";
     homepage    = https://bitbucket.org/mchaput/whoosh;
     license     = licenses.bsd2;
     maintainers = with maintainers; [ nand0p ];
-    platforms   = platforms.all;
   };
 }