diff --git a/tests/testthat.R b/tests/testthat.R
index 3d98191..83abcb8 100644
--- a/tests/testthat.R
+++ b/tests/testthat.R
@@ -8,5 +8,10 @@
 
 library(testthat)
 library(nonmem2rx)
+library(rxode2)
+setRxThreads(1L)
+library(data.table)
+setDTthreads(1L)
+
 
 test_check("nonmem2rx")