diff --git a/src/bot/audioCaptureProcedure.ts b/src/bot/audioCaptureProcedure.ts
index 739539e..b1e35d0 100644
--- a/src/bot/audioCaptureProcedure.ts
+++ b/src/bot/audioCaptureProcedure.ts
@@ -95,8 +95,9 @@ export class AudioCaptureProcedure {
             let samplesCollected = 0;
             let skippedSilentChunks = 0;
             const minRmsThreshold = 0.0015;
-            // Collect ~1 second of audio at native rate before emitting
-            const samplesPerChunk = nativeRate;
+            // Collect ~2 seconds of audio at native rate before emitting.
+            // Larger chunks improve STT stability and reduce fragment transcripts.
+            const samplesPerChunk = nativeRate * 2;
             const targetRate = 16000;
 
             processor.onaudioprocess = (e: AudioProcessingEvent) => {