diff --git a/TTS/tts/layers/xtts/tokenizer.py b/TTS/tts/layers/xtts/tokenizer.py
index 1eb66309..f34a7ac0 100644
--- a/TTS/tts/layers/xtts/tokenizer.py
+++ b/TTS/tts/layers/xtts/tokenizer.py
@@ -509,3 +509,6 @@ class VoiceBpeTokenizer:
 
     def __len__(self):
         return self.tokenizer.get_vocab_size()
+
+    def get_number_tokens(self):
+        return max(self.tokenizer.get_vocab().values()) + 1
diff --git a/TTS/tts/models/xtts.py b/TTS/tts/models/xtts.py
index 784ba1be..76c5595e 100644
--- a/TTS/tts/models/xtts.py
+++ b/TTS/tts/models/xtts.py
@@ -312,7 +312,7 @@ class Xtts(BaseTTS):
     def init_models(self):
         """Initialize the models. We do it here since we need to load the tokenizer first."""
         if self.tokenizer.tokenizer is not None:
-            self.args.gpt_number_text_tokens = max(self.tokenizer.tokenizer.get_vocab().values()) + 1
+            self.args.gpt_number_text_tokens = self.tokenizer.get_number_tokens()
             self.args.gpt_start_text_token = self.tokenizer.tokenizer.token_to_id("[START]")
             self.args.gpt_stop_text_token = self.tokenizer.tokenizer.token_to_id("[STOP]")