diff --git a/pkgs/development/python-modules/jupyter_core/default.nix b/pkgs/development/python-modules/jupyter_core/default.nix
index 88679197be1..f682e11bfed 100644
--- a/pkgs/development/python-modules/jupyter_core/default.nix
+++ b/pkgs/development/python-modules/jupyter_core/default.nix
@@ -14,7 +14,7 @@ buildPythonPackage rec {
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "2c6e7c1e9f2ac45b5c2ceea5730bc9008d92fe59d0725eac57b04c0edfba24f7";
+    sha256 = "1xr4pbghwk5hayn5wwnhb7z95380r45p79gf5if5pi1akwg7qvic";
   };
 
   checkInputs = [ pytest mock glibcLocales ];
@@ -23,8 +23,7 @@ buildPythonPackage rec {
   patches = [ ./tests_respect_pythonpath.patch ];
 
   checkPhase = ''
-    mkdir tmp
-    HOME=tmp TMPDIR=tmp LC_ALL=en_US.utf8 py.test
+    HOME=$TMPDIR LC_ALL=en_US.utf8 py.test
   '';
 
   meta = with lib; {