diff --git a/lib/synth-audio.js b/lib/synth-audio.js
index e525a97..6fdd5f9 100644
--- a/lib/synth-audio.js
+++ b/lib/synth-audio.js
@@ -183,7 +183,15 @@ async function synthAudio(client, logger, stats, { account_sid,
       case 'azure':
       case 'microsoft':
         vendorLabel = 'microsoft';
-        audioBuffer = await synthMicrosoft(logger, {credentials, stats, language, voice, text, deploymentId, filePath});
+        audioBuffer = await synthMicrosoft(logger, {credentials, stats, language, voice, text, deploymentId,
+          filePath, renderForCaching});
+        if (typeof audioBuffer === 'object' && audioBuffer.filePath) {
+          return audioBuffer;
+        }
+        else {
+          audioBuffer = await synthMicrosoft(logger, {credentials, stats, language, voice, text, deploymentId,
+            filePath});
+        }
         break;
       case 'nuance':
         model = model || 'enhanced';