diff --git a/ws/Docbook/Preprocess/make.rules b/ws/Docbook/Preprocess/make.rules
index 372c870935375bd86a595f7a40ea582649f361ef..e4bc50bbccdf4de902ef03438840a5e0c22acbc4 100644
--- a/ws/Docbook/Preprocess/make.rules
+++ b/ws/Docbook/Preprocess/make.rules
@@ -143,7 +143,7 @@ SAXONCMD=java -cp "${DBOOK_XSL}/tools/lib/saxon9he.jar:/usr/share/java/xercesImp
 
 %.slide: %.slide.xml
 	${SAXON6CMD} $< ${DBOOK_XSL_CUSTOM}/slide/slideHdm.xsl ${dbookXslSlideParam}
-	rsync -a /usr/share/reveal.js .
+	rsync -a --exclude .git /usr/share/reveal.js .
 	cd reveal.js; patch -p1 < ${DBOOK_XSL_CUSTOM}/slide/reveal.css.patch
 	touch $*.slide