diff --git a/tests/testthat.R b/tests/testthat.R
index d3a15ea..c8d4598 100644
--- a/tests/testthat.R
+++ b/tests/testthat.R
@@ -1,3 +1,4 @@
+data.table::setDTthreads(2)
 library(testthat)
 library(tidytransit)