diff --git a/lib/tasks/say.js b/lib/tasks/say.js
index 702a3d2d..11b55e9a 100644
--- a/lib/tasks/say.js
+++ b/lib/tasks/say.js
@@ -100,7 +100,7 @@ class TaskSay extends TtsTask {
     }
 
     ep.set({
-      tts_engine: vendor,
+      tts_engine: vendor.startsWith('custom:') ? 'custom' : vendor,
       tts_voice: voice,
       cache_speech_handles: !cs.currentTtsVendor || cs.currentTtsVendor === vendor ? 1 : 0,
     }).catch((err) => this.logger.info({err}, 'Error setting tts_engine on endpoint'));