diff --git a/test/unstoppable.service b/test/unstoppable.service
index 24fb0a25e16..56b72c98f75 100644
--- a/test/unstoppable.service
+++ b/test/unstoppable.service
@@ -1,5 +1,5 @@
 [Service]
 Type=oneshot
 RemainAfterExit=yes
-ExecStart=/bin/echo 'I'm unstoppable!'
+ExecStart=/bin/echo "I'm unstoppable!"
 ExecStop=/bin/systemctl start --no-block unstoppable.service