diff --git a/share/mk/doc.docbook.mk b/share/mk/doc.docbook.mk
index eed947e10e..7955530361 100644
--- a/share/mk/doc.docbook.mk
+++ b/share/mk/doc.docbook.mk
@@ -234,7 +234,7 @@ CLEANFILES+= ${DOC}.aux ${DOC}.dvi ${DOC}.log ${DOC}.out ${DOC}.tex-pdf ${DOC}.t
 .if ${RENDERENGINE} == "fop"
 XSLTPROCOPTS+=	--param img.src.path "'${IMGDIR}/'"
 XSLTPROCOPTS+=	--param callout.graphics.path "'${CALLOUTDIR}/'"
-XSLTPROCOPTS+=	--maxdepth 6000
+XSLTPROCOPTS+=	--maxdepth 12000
 .endif
 .for _curimage in ${LOCAL_IMAGES_EPS:M*share*}
 CLEANFILES+= ${_curimage:T} ${_curimage:H:T}/${_curimage:T}