diff --git a/src/main.py b/src/main.py
index 9c0e24c..d94ebde 100644
--- a/src/main.py
+++ b/src/main.py
@@ -44,7 +44,7 @@ class MinSizePerRequestError(Exception):
 
 
 @api.get('/')
-def test_data(api_key: str, request: Request, size: str) -> StreamingResponse:
+async def test_data(api_key: str, request: Request, size: str) -> StreamingResponse:
     try:
         if api_key not in AUTHORIZED_KEYS:
             raise HTTPException(
diff --git a/src/utils.py b/src/utils.py
index 521e23c..d703da9 100644
--- a/src/utils.py
+++ b/src/utils.py
@@ -20,7 +20,7 @@ def convert_to_bytes(size: int | str) -> int:
         raise ValueError
 
 
-def generate_data(size: int, buffer_size: int = 4 * 1024) -> bytes:
+async def generate_data(size: int, buffer_size: int = 4 * 1024) -> bytes:
     size_left = size
 
     while size_left > buffer_size: