diff --git a/serving-tiles/updating-as-people-edit-pyosmium.md b/serving-tiles/updating-as-people-edit-pyosmium.md
index 1b98491..d06c66f 100644
--- a/serving-tiles/updating-as-people-edit-pyosmium.md
+++ b/serving-tiles/updating-as-people-edit-pyosmium.md
@@ -115,7 +115,7 @@ It's a good idea to clear the "pyosmium is running" flag when renderd is restate
 
 and add:
 
-    ExecStartPre=rm /var/cache/renderd/pyosmium/call_pyosmium.running
+    ExecStartPre=rm -f /var/cache/renderd/pyosmium/call_pyosmium.running
 
 in the "[Service]" section.  Then: