diff --git a/ws/Docbook/Preprocess/make.rules b/ws/Docbook/Preprocess/make.rules
index c4f694611d209ce130565523f3ae3075f2cd1c7f..a5e26ad3f583d88bcd0584cd1576b18c7d225284 100644
--- a/ws/Docbook/Preprocess/make.rules
+++ b/ws/Docbook/Preprocess/make.rules
@@ -27,6 +27,7 @@ graphicsize.use.img.src.path=1 \
 highlight.source=1 \
 use.id.as.filename=1 \
 id.warnings=1 \
+ulink.target=_blank \
 olink.debug=1 \
 ${localDbookXslCommonParam}