diff --git a/src/api.rs b/src/api.rs
index fd24877..b48fe49 100644
--- a/src/api.rs
+++ b/src/api.rs
@@ -1088,23 +1088,32 @@ mod tests {
         ingest_lines(&engine, 0, &["request path=/a", "level=info x=1"]).await;
 
         let (_, before) = get_json(&app, "/api/params").await;
-        let before_names: Vec<&str> =
-            before.as_array().unwrap().iter().map(|p| p["name"].as_str().unwrap()).collect();
-        assert!(before_names.contains(&"path"));
-        assert!(before_names.contains(&"level"));
-        assert!(before_names.contains(&"x"));
+        // Ticket 055 merges the three non-deletable `ottyl_*` reserved names into this listing
+        // too; `DELETE /api/params` (ticket 052) only ever clears real declarations, so the
+        // reserved ones must be excluded from the "everything got removed" count below.
+        let before_declared: Vec<&str> = before
+            .as_array()
+            .unwrap()
+            .iter()
+            .filter(|p| p["reserved"] != true)
+            .map(|p| p["name"].as_str().unwrap())
+            .collect();
+        assert!(before_declared.contains(&"path"));
+        assert!(before_declared.contains(&"level"));
+        assert!(before_declared.contains(&"x"));
 
         let (status, result) = send_json(&app, "DELETE", "/api/params", json!({})).await;
         assert_eq!(status, StatusCode::OK);
-        assert_eq!(result["removed"], before_names.len() as u64);
+        assert_eq!(result["removed"], before_declared.len() as u64);
         // Re-derived without any new ingest — same three keys come back, now all auto-derived.
         assert_eq!(result["reextracted"], 3);
         assert_eq!(result["logs_considered"], 2);
 
         let (_, after) = get_json(&app, "/api/params").await;
-        let after_params = after.as_array().unwrap();
-        assert_eq!(after_params.len(), 3);
-        assert!(after_params.iter().all(|p| p["auto_derived"] == true));
+        let after_declared: Vec<_> =
+            after.as_array().unwrap().iter().filter(|p| p["reserved"] != true).collect();
+        assert_eq!(after_declared.len(), 3);
+        assert!(after_declared.iter().all(|p| p["auto_derived"] == true));
 
         // The clear persisted: "path" (the only manually-declared, profile-stored param) doesn't
         // reappear from settings.json on a fresh load.