diff --git a/jenkins.sh b/jenkins.sh
index 359fd22771123c15f1e24848fbb01a690570b88c..9646ac0b016b92c544a26b9459cf2575233fed81 100755
--- a/jenkins.sh
+++ b/jenkins.sh
@@ -3,6 +3,7 @@
 : ${WORKSPACE:="$(pwd)"}
 
 export PYTHONDONTWRITEBYTECODE=yep
+export SYNAPSE_CACHE_FACTOR=1
 
 # Output test results as junit xml
 export TRIAL_FLAGS="--reporter=subunit"