diff --git a/makefile.locale b/makefile.locale
index 17819546702fadaddb055a041d0a1bdec1a8b462..6f6ae7b020dbd45d7a050f76aeeb2e07030fe3af 100644
--- a/makefile.locale
+++ b/makefile.locale
@@ -49,6 +49,7 @@ ASCIIDOC_EXTRA += -amanmanual='Git Manual' \
                   -amansource='Git $(GIT_VERSION)' \
                   -amanversion=$(GIT_VERSION)
 ASCIIDOC_EXTRA += -alitdd='\--'
+ASCIIDOC_EXTRA += -acompat-mode -atabsize=8
 
 $(HTML_FILTER): %.html: %.txt
 	$(QUIET_ASCIIDOC)asciidoctor -b xhtml5 \