diff --git a/db/jambones-sql.sql b/db/jambones-sql.sql
index f019f8f..83e194c 100644
--- a/db/jambones-sql.sql
+++ b/db/jambones-sql.sql
@@ -503,7 +503,7 @@ messaging_hook_sid CHAR(36) COMMENT 'webhook to call for inbound SMS/MMS ',
 app_json TEXT,
 speech_synthesis_vendor VARCHAR(64) NOT NULL DEFAULT 'google',
 speech_synthesis_language VARCHAR(12) NOT NULL DEFAULT 'en-US',
-speech_synthesis_voice VARCHAR(256),
+speech_synthesis_voice VARCHAR(256) DEFAULT 'en-US-Standard-C',
 speech_synthesis_label VARCHAR(64),
 speech_recognizer_vendor VARCHAR(64) NOT NULL DEFAULT 'google',
 speech_recognizer_language VARCHAR(64) NOT NULL DEFAULT 'en-US',
diff --git a/db/upgrade-jambonz-db.js b/db/upgrade-jambonz-db.js
index bf8076a..127071a 100644
--- a/db/upgrade-jambonz-db.js
+++ b/db/upgrade-jambonz-db.js
@@ -228,6 +228,10 @@ const sql = {
   ],
   9004: [
     'ALTER TABLE applications ADD COLUMN env_vars TEXT',
+  ],
+  9005: [
+    'UPDATE applications SET speech_synthesis_voice = \'en-US-Standard-C\' WHERE speech_synthesis_voice IS NULL AND speech_synthesis_vendor = \'google\' AND speech_synthesis_language = \'en-US\'',
+    'ALTER TABLE applications MODIFY COLUMN speech_synthesis_voice VARCHAR(255) DEFAULT \'en-US-Standard-C\''
   ]
 };