diff --git a/files/image_config/fstrim/fstrim.timer b/files/image_config/fstrim/fstrim.timer
index c6142dd948..3ffb2332b7 100644
--- a/files/image_config/fstrim/fstrim.timer
+++ b/files/image_config/fstrim/fstrim.timer
@@ -1,6 +1,7 @@
 [Unit]
 Description=Discard unused blocks once a week
 Documentation=man:fstrim
+After=sonic.target
 
 [Timer]
 OnCalendar=weekly