diff --git a/tests/run_test b/tests/run_test
index 757d5aa..f3a1a91 100755
--- a/tests/run_test
+++ b/tests/run_test
@@ -2,4 +2,4 @@
 
 #run one test. start from main directory
 
-python3 -m unittest discover tests $@ -vvvf 
+python -m unittest discover tests $@ -vvvf