diff --git a/vllm_plugin/model.py b/vllm_plugin/model.py
index bcb4ca3..178fb74 100644
--- a/vllm_plugin/model.py
+++ b/vllm_plugin/model.py
@@ -558,7 +558,7 @@ class VibeVoiceProcessingInfo(BaseProcessingInfo):
         return tokens
 
     def get_supported_mm_limits(self) -> Mapping[str, int | None]:
-        return {"audio": None}
+        return {"audio": 1}
 
 
 class VibeVoiceDummyInputsBuilder(BaseDummyInputsBuilder[VibeVoiceProcessingInfo]):