diff --git a/fastapi_admin/site.py b/fastapi_admin/site.py
index b501300..fdf8d66 100644
--- a/fastapi_admin/site.py
+++ b/fastapi_admin/site.py
@@ -68,6 +68,7 @@ class Field(BaseModel):
     ref: Optional[str]
     description: Optional[str]
     disabled: Optional[bool] = False
+    step: str = 'any'
 
 
 class Resource(BaseModel):