diff --git a/testsuite/multiprocessing_unitary_tests/Makefile b/testsuite/multiprocessing_unitary_tests/Makefile
index 129d339f..209baedf 100644
--- a/testsuite/multiprocessing_unitary_tests/Makefile
+++ b/testsuite/multiprocessing_unitary_tests/Makefile
@@ -1,4 +1,4 @@
 POK_PATH := $(CURDIR)/../..
 
 check::
-	avocado run  --xunit report.xml --mux-yaml testconfig.yaml -- $(POK_PATH)/misc/execution_test_multiprocessing.py
+	avocado run --nrunner-max-parallel-tasks 1 --xunit report.xml --mux-yaml testconfig.yaml -- $(POK_PATH)/misc/execution_test_multiprocessing.py
diff --git a/testsuite/unitary_tests/Makefile b/testsuite/unitary_tests/Makefile
index b62df427..9fea2d83 100644
--- a/testsuite/unitary_tests/Makefile
+++ b/testsuite/unitary_tests/Makefile
@@ -1,4 +1,4 @@
 POK_PATH := $(CURDIR)/../..
 
 check::
-	avocado run  --xunit report.xml --mux-yaml testconfig.yaml -- $(POK_PATH)/misc/execution_test.py
+	avocado run --nrunner-max-parallel-tasks 1 --xunit report.xml --mux-yaml testconfig.yaml -- $(POK_PATH)/misc/execution_test.py