diff --git a/Makefile b/Makefile
index ef855a36..fb27bc42 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@ default: clean build
 
 ## `make preview`: start the built-in Jekyll preview
 preview: clean
-	$S bundle exec jekyll serve --incremental
+	$S export LANG=C.UTF-8 ; bundle exec jekyll serve --incremental
 
 ## `make test`: don't build, but do run all tests
 test: pre-build-tests post-build-tests