diff --git a/Makefile b/Makefile
index 3310dec..e5ff336 100644
--- a/Makefile
+++ b/Makefile
@@ -17,9 +17,9 @@ run: $(EXEC)
 	@chmod +x $(EXEC)
 	sudo $(EXEC)
 
-NETNS=practical_murdock
+NS=practical_murdock
 ssh:
-	sudo ip netns exec $(NETNS) ssh -o StrictHostKeychecking=no 172.16.0.2
+	sudo ip netns exec $(NS) ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeychecking=no 172.16.0.2
 
 ci:
 	golangci-lint run --fix