diff --git a/mdmonitor.service b/mdmonitor.service
index 778be70..0b82559 100644
--- a/mdmonitor.service
+++ b/mdmonitor.service
@@ -8,6 +8,7 @@
 [Unit]
 Description=MD array monitor
 DefaultDependencies=no
+ConditionPathExists=/run
 
 [Service]
 Type=forking