diff --git a/lib/ai/runtime/recent-dialogue-memory.ts b/lib/ai/runtime/recent-dialogue-memory.ts
index fa8dbd113..b6b5640fd 100644
--- a/lib/ai/runtime/recent-dialogue-memory.ts
+++ b/lib/ai/runtime/recent-dialogue-memory.ts
@@ -91,20 +91,20 @@ export function buildRecentDialogueMemory(params: {
   const maxCharsPerEntry = Math.max(80, Math.min(500, params.maxCharsPerEntry || 220));
   const maxTotalChars = Math.max(160, Math.min(1600, params.maxTotalChars || 900));
 
-  const sourceEntries = messages
-    .slice(-maxSourceMessages)
-    .map((message) => {
-      const role = message.role === "assistant" ? "assistant" : message.role === "user" ? "user" : null;
-      if (!role) return null;
-      const content = getMessageText(message, maxCharsPerEntry);
-      if (!content) return null;
-      return {
-        role,
-        content,
-        messageId: message.id,
-      } satisfies RecentDialogueMemoryEntry;
-    })
-    .filter((entry): entry is RecentDialogueMemoryEntry => Boolean(entry));
+  const sourceEntries: RecentDialogueMemoryEntry[] = [];
+  for (const message of messages.slice(-maxSourceMessages)) {
+    const role = message.role === "assistant" ? "assistant" : message.role === "user" ? "user" : null;
+    if (!role) continue;
+
+    const content = getMessageText(message, maxCharsPerEntry);
+    if (!content) continue;
+
+    sourceEntries.push({
+      role,
+      content,
+      messageId: message.id,
+    });
+  }
 
   const preferredEntries =
     isRecallRequest && !assistantRecall