diff --git a/t/selenium/testrunner b/t/selenium/testrunner
index a2b9cc1f..4b2b6c0e 100755
--- a/t/selenium/testrunner
+++ b/t/selenium/testrunner
@@ -63,7 +63,7 @@ if [ "${OUTPUT_TYPE:-}" = "junit" ] ; then
   RC="${PIPESTATUS[0]}"
 else
   #Change thread count here and in nose2cfg/localtest.cfg
-  export THREADS=2
+  export THREADS=1
   python3 testrun.py -v -c nose2cfg/localtest.cfg|| RC=$?
 fi