diff --git a/jenkins_build b/jenkins_build
index d7a271ac4..7a9b397ae 100755
--- a/jenkins_build
+++ b/jenkins_build
@@ -39,7 +39,7 @@ if test "${job_name}" = "master branch"; then
     # next, build the PDF
     # extra option needed to satisfy "levels nested too deeply" error
     # expect it to fail (thus exit 0) since nexus.ind not found first time
-    pdflatex --interaction=nonstopmode nexus.tex || exit 0
+    ( pdflatex --interaction=nonstopmode nexus.tex || exit 0 )
     # run again with fresh nexus.ind
     pdflatex --interaction=nonstopmode nexus.tex
     cd ..