diff --git a/test/run_tests_py2 b/test/run_tests_py2
index dd47e5b20..0ad4b40a0 100755
--- a/test/run_tests_py2
+++ b/test/run_tests_py2
@@ -1,3 +1,3 @@
 #! /bin/sh
 PYTHON=python2
-source $(dirname $0)/run_tests "$@"
+. $(dirname $0)/run_tests "$@"
diff --git a/test/run_tests_py3 b/test/run_tests_py3
index 5bc703026..3fe3b8a6e 100755
--- a/test/run_tests_py3
+++ b/test/run_tests_py3
@@ -1,3 +1,3 @@
 #! /bin/sh
 PYTHON=python3
-source $(dirname $0)/run_tests "$@"
+. $(dirname $0)/run_tests "$@"