diff --git a/software/ipython_notebook/buildout.hash.cfg b/software/ipython_notebook/buildout.hash.cfg
index 4f05c28179424b2cd41a0309153b1d9a6bdba76c..568ad3e7fb99cf17c46b8c0dc6ceb215ca1542f8 100644
--- a/software/ipython_notebook/buildout.hash.cfg
+++ b/software/ipython_notebook/buildout.hash.cfg
@@ -16,7 +16,7 @@
 
 [instance-jupyter]
 filename = instance.cfg.in
-md5sum = c9d2c7a3658457b7f43cbbbc38ef247c
+md5sum = 2c0ecc6f045504cb037709429132e08c
 
 [ipython-notebook-config]
 filename = template/ipython_notebook_config.py.jinja
diff --git a/software/ipython_notebook/instance.cfg.in b/software/ipython_notebook/instance.cfg.in
index 4a5946ad1312d851b9a05317aa168c57fd93a719..d490b34b98af66109d6f05b7d8b10e588748ffc2 100644
--- a/software/ipython_notebook/instance.cfg.in
+++ b/software/ipython_notebook/instance.cfg.in
@@ -78,9 +78,7 @@ parameters-extra = true
 environment =
   IPYTHONDIR=${directory:ipython_dir}
   JUPYTER_CONFIG_DIR=${directory:ipython_dir}
-  LC_ALL=C.UTF-8
   LANG=C.UTF-8
-  LANGUAGE=C.UTF-8
 
 [ipython-notebook-config]
 <= dynamic-jinja2-template-base