diff --git a/systemd/mdadm-grow-continue@.service b/systemd/mdadm-grow-continue@.service
index 882bc0b..5c667d2 100644
--- a/systemd/mdadm-grow-continue@.service
+++ b/systemd/mdadm-grow-continue@.service
@@ -10,7 +10,7 @@ Description=Manage MD Reshape on /dev/%I
 DefaultDependencies=no
 
 [Service]
-ExecStart=BINDIR/mdadm --grow --continue /dev/%i
+ExecStart=BINDIR/mdadm --grow --continue /dev/%I
 StandardInput=null
 StandardOutput=null
 StandardError=null