diff --git a/packages/orchestration-service/src/services/summarization.js b/packages/orchestration-service/src/services/summarization.js
index d2e2a24..186200e 100644
--- a/packages/orchestration-service/src/services/summarization.js
+++ b/packages/orchestration-service/src/services/summarization.js
@@ -83,7 +83,7 @@ async function maybeSummarize(session, allEpisodes) {
     }
 
     // 4. Determine episode range string  e.g. "1-42"
-    const ids = allEpisodes.map(ep => ep.id);
+    const ids = allEpisodes.map(ep => ep.id).sort((a,b) => a - b);
     const episodeRange = `${ids.at(0)}-${ids.at(-1)}`;
     const totalEpisodeTokens = allEpisodes.reduce((sum, ep) => sum + (ep.token_count || 0), 0);