diff --git a/.travis/run-tests-javascript.sh b/.travis/run-tests-javascript.sh
index 402533834..166db3b65 100755
--- a/.travis/run-tests-javascript.sh
+++ b/.travis/run-tests-javascript.sh
@@ -2,4 +2,4 @@
 
 set -euo pipefail
 
-mvn -q -Dparallel=methods -DthreadCount=4 -Dtest=javascript.* test
+mvn -q -Dparallel=methods -DthreadCount=1 -Dtest=javascript.* test