diff --git a/homeassistant/components/watson_tts/tts.py b/homeassistant/components/watson_tts/tts.py
index 27bfff9550b..9b2af2ea7fe 100644
--- a/homeassistant/components/watson_tts/tts.py
+++ b/homeassistant/components/watson_tts/tts.py
@@ -26,6 +26,8 @@ SUPPORTED_VOICES = [
     "de-DE_ErikaV3Voice",
     "en-GB_KateV3Voice",
     "en-GB_KateVoice",
+    "en-GB_CharlotteV3Voice",
+    "en-GB_JamesV3Voice",
     "en-US_AllisonV3Voice",
     "en-US_AllisonVoice",
     "en-US_EmilyV3Voice",