diff --git a/pssecret_server/models.py b/pssecret_server/models.py
index aa64d3e..3298354 100644
--- a/pssecret_server/models.py
+++ b/pssecret_server/models.py
@@ -2,7 +2,7 @@ from pydantic import BaseModel, Field
 
 
 class Secret(BaseModel):
-    data: str = Field(title="Secret", description="Some secret data")
+    data: str = Field(title="Secret", description="Some secret data", min_length=1)
 
 
 class SecretSaveResult(BaseModel):