diff --git a/test/security_manager_sc/Makefile b/test/security_manager_sc/Makefile
index e56f16589..013294f7b 100644
--- a/test/security_manager_sc/Makefile
+++ b/test/security_manager_sc/Makefile
@@ -96,4 +96,5 @@ myclean:
 clean: myclean
 
 test: sm_test
+	rm -rf SM_*
 	python3 ./sm_test.py