diff --git a/pkgs/development/python-modules/pytest-mock/default.nix b/pkgs/development/python-modules/pytest-mock/default.nix
new file mode 100644
index 00000000000..7cb5224c60b
--- /dev/null
+++ b/pkgs/development/python-modules/pytest-mock/default.nix
@@ -0,0 +1,25 @@
+{ lib, buildPythonPackage, fetchPypi, isPy3k, pytest, mock, setuptools_scm }:
+
+buildPythonPackage rec {
+  pname = "pytest-mock";
+  version = "1.6.3";
+ 
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "920d1167af5c2c2ad3fa0717d0c6c52e97e97810160c15721ac895cac53abb1c";
+  };
+
+  propagatedBuildInputs = [ pytest ] ++ lib.optional (!isPy3k) mock;
+  nativeBuildInputs = [ setuptools_scm ];
+
+  checkPhase = ''
+    py.test
+  '';
+
+  meta = with lib; {
+    description = "Thin-wrapper around the mock package for easier use with py.test.";
+    homepage    = https://github.com/pytest-dev/pytest-mock;
+    license     = licenses.mit;
+    maintainers = with maintainers; [ nand0p ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index ea5af9fa92b..44a270b4db1 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -3261,27 +3261,7 @@ in {
     };
   };
 
-  pytest-mock = buildPythonPackage rec {
-    name = "${pname}-${version}";
-    pname = "pytest-mock";
-    version = "1.6.0";
-
-    buildInputs = with self; [ pytest setuptools_scm ];
-    propagatedBuildInputs = with self; [ mock ];
-
-    meta = {
-      description = "Thin-wrapper around the mock package for easier use with py.test.";
-      homepage    = "https://github.com/pytest-dev/pytest-mock";
-      license     = licenses.mit;
-      maintainers = with maintainers; [ nand0p ];
-      platforms   = platforms.all;
-    };
-
-    src = fetchPypi {
-      inherit pname version;
-      sha256 = "07qccww4bq9jxlc0fbhlspr13kcsixchsnl8vk4wdiyvsjy7r8c3";
-    };
-  };
+  pytest-mock = callPackage ../development/python-modules/pytest-mock { };
 
   pytest-timeout = callPackage ../development/python-modules/pytest-timeout { };