diff --git a/package/doc-asciidoc.mk b/package/doc-asciidoc.mk
index 2bd761edfb..931c5136d4 100644
--- a/package/doc-asciidoc.mk
+++ b/package/doc-asciidoc.mk
@@ -86,11 +86,13 @@ ifneq ($$(wildcard $$($(2)_$(3)_ASCIIDOC_CONF)),)
 $(2)_$(3)_ASCIIDOC_OPTS += -f $$($(2)_$(3)_ASCIIDOC_CONF)
 endif
 
+$(2)_$(3)_A2X_OPTS = \
+	--xsltproc-opts "--stringparam toc.section.depth 1"
+
 # Handle a2x warning about --destination-dir option only applicable to HTML
 # based outputs. So:
 # - use the --destination-dir option if possible (html and split-html),
 # - otherwise copy the generated document to the output directory
-$(2)_$(3)_A2X_OPTS =
 ifneq ($$(filter $(4),html split-html),)
 $(2)_$(3)_A2X_OPTS += --destination-dir="$$(@D)"
 else
@@ -161,11 +163,9 @@ $(1)-prepare-sources: $$(BUILD_DIR)/docs/$(1)/.stamp_doc_rsynced
 
 $(2)_ASCIIDOC_CONF = $$($(2)_DOCDIR)/asciidoc.conf
 
-$(call ASCIIDOC_INNER,$(1),$(2),xhtml,html,html,HTML,\
-	--xsltproc-opts "--stringparam toc.section.depth 1")
+$(call ASCIIDOC_INNER,$(1),$(2),xhtml,html,html,HTML)
 
-$(call ASCIIDOC_INNER,$(1),$(2),chunked,split-html,chunked,split HTML,\
-	--xsltproc-opts "--stringparam toc.section.depth 1")
+$(call ASCIIDOC_INNER,$(1),$(2),chunked,split-html,chunked,split HTML)
 
 # dblatex needs to pass the '--maxvars ...' option to xsltproc to prevent it
 # from reaching the template recursion limit when processing the (long) target