diff --git a/docs/contribute.rst b/docs/contribute.rst
index 3960b3f9..0090dd07 100644
--- a/docs/contribute.rst
+++ b/docs/contribute.rst
@@ -43,9 +43,9 @@ If you have made changes that affect the output of a pelican generated weblog,
 then you should update the output used by functional tests.
 To do so, you can use the 2 following commands::
 
-    $ pelican -o tests/output/custom/ -s samples/pelican.conf.py \
+    $ LC_ALL="C" pelican -o tests/output/custom/ -s samples/pelican.conf.py \
         samples/content/
-    $ USER="Dummy Author" pelican -o tests/output/basic/ samples/content/
+    $ LC_ALL="C" USER="Dummy Author" pelican -o tests/output/basic/ samples/content/
 
 Coding standards
 ================