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-rw-r--r--pkgs/development/python-modules/nbconvert/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/python-modules/nbconvert/default.nix b/pkgs/development/python-modules/nbconvert/default.nix
index d04e5c5eccbd..c0b8b90bd089 100644
--- a/pkgs/development/python-modules/nbconvert/default.nix
+++ b/pkgs/development/python-modules/nbconvert/default.nix
@@ -39,7 +39,7 @@ buildPythonPackage rec {
 
   checkPhase = ''
     mkdir tmp
-    LC_ALL=en_US.utf8 HOME=`realpath tmp` py.test -v
+    LC_ALL=en_US.UTF-8 HOME=`realpath tmp` py.test -v
   '';
 
   meta = {