diff --git a/contrib/jenkins.sh b/contrib/jenkins.sh
index fbcd73c4..0ade9b49 100755
--- a/contrib/jenkins.sh
+++ b/contrib/jenkins.sh
@@ -6,6 +6,8 @@
 # * PUBLISH: upload manuals after building if set to "1" (ignored without WITH_MANUALS = "1")
 #
 
+export PYTHONUNBUFFERED=1
+
 if [ ! -d "./pysim-testdata/" ] ; then
 	echo "###############################################"
 	echo "Please call from pySim-prog top directory"