diff --git a/.testr.conf b/.testr.conf
index bb49f15d..ed0237d1 100644
--- a/.testr.conf
+++ b/.testr.conf
@@ -7,3 +7,4 @@ test_command=OS_STDOUT_CAPTURE=${OS_STDOUT_CAPTURE:-1} \
 
 test_id_option=--load-list $IDFILE
 test_list_option=--list
+test_run_concurrency=echo ${TEST_RUN_CONCURRENCY:-0}