diff --git a/ansible/Makefile b/ansible/Makefile
index d8bef6c..3896577 100644
--- a/ansible/Makefile
+++ b/ansible/Makefile
@@ -9,7 +9,7 @@ ps:
 	@echo "ps aux" ; \
 	cat inv-template.yml  > inv.yml ; \
 	swarmlab-getworkers >> inv.yml ; \
-	ansible-playbook -u ubuntu -inv.yml examples/ps.yml   -f 5  --private-key=/home/ubuntu/.ssh/id_rsa ; \
+	ansible-playbook -u ubuntu -i inv.yml examples/ps.yml   -f 5  --private-key=/home/ubuntu/.ssh/id_rsa ; \