diff --git a/admin_manual/configuration_server/config_sample_php_parameters.rst b/admin_manual/configuration_server/config_sample_php_parameters.rst
index 0e7bbef8b..e2aff0a05 100644
--- a/admin_manual/configuration_server/config_sample_php_parameters.rst
+++ b/admin_manual/configuration_server/config_sample_php_parameters.rst
@@ -1007,7 +1007,7 @@ Defaults to ``2``
 
 	'preview_max_filesize_image' => 50,
 
-max file size for generating image previews with imagegd (default behavior)
+max file size for generating image previews with imagegd (default behaviour)
 If the image is bigger, it'll try other preview generators, but will most
 likely show the default mimetype icon. Set to -1 for no limit.