diff --git a/jarvis_core/util/__init__.py b/jarvis_core/util/__init__.py
index bbef2da..b5feb65 100644
--- a/jarvis_core/util/__init__.py
+++ b/jarvis_core/util/__init__.py
@@ -98,9 +98,15 @@ async def hash(
         resp = await session.get(data)
         resp.raise_for_status()
         content_type = resp.content_type
-        data_len = resp.content_length
+
+        # While we could use resp.content_length, that sometimes returns None,
+        # so we manually count the size while looping.
+        data_len = 0
+        block_count = 0
 
         async for block in resp.content.iter_chunked(n=size):
+            data_len += len(block)
+            block_count += 1
             method.update(block)
 
         return method.hexdigest(), data_len, content_type