diff --git a/NucleicRemote/NucleicRemote/Models/SessionCache.swift b/NucleicRemote/NucleicRemote/Models/SessionCache.swift
index 118d543..fa8b0f2 100644
--- a/NucleicRemote/NucleicRemote/Models/SessionCache.swift
+++ b/NucleicRemote/NucleicRemote/Models/SessionCache.swift
@@ -70,7 +70,7 @@ enum SessionCache {
         let kept = Array(summaries.sorted { $0.updatedAt > $1.updatedAt }.prefix(sessionLimit))
         if let data = try? JSONEncoder().encode(kept) { try? data.write(to: url, options: .atomic) }
         // Drop transcript files for sessions that fell out of the recent set.
-        let keep = Set(kept.map(transcriptFileName))
+        let keep = Set(kept.map { transcriptFileName($0.sessionID) })
         if let files = try? FileManager.default.contentsOfDirectory(
             at: dir, includingPropertiesForKeys: nil) {
             for file in files where !keep.contains(file.lastPathComponent) {