diff --git a/fish_speech/utils/schema.py b/fish_speech/utils/schema.py
index 1ef4dcd3..fc3c9eda 100644
--- a/fish_speech/utils/schema.py
+++ b/fish_speech/utils/schema.py
@@ -79,7 +79,7 @@ def __repr__(self) -> str:
 
 
 class ServeTTSRequest(BaseModel):
-    text: str
+    text: str = Field(..., min_length=1)
     chunk_length: Annotated[int, conint(ge=100, le=1000, strict=True)] = 200
     # Audio format
     format: Literal["wav", "pcm", "mp3", "opus"] = "wav"