diff --git a/plugins/Bigfile/BigfilePlugin.py b/plugins/Bigfile/BigfilePlugin.py
index 31e7ae9f..03a0f44f 100644
--- a/plugins/Bigfile/BigfilePlugin.py
+++ b/plugins/Bigfile/BigfilePlugin.py
@@ -620,9 +620,10 @@ class FileRequestPlugin(object):
         if file.read(10) == b"\0" * 10:
             # Looks empty, but makes sures we don't have that piece
             file_info = site.content_manager.getFileInfo(inner_path)
-            piece_i = int(pos / file_info["piece_size"])
-            if not site.storage.piecefields[file_info["sha512"]][piece_i]:
-                return False
+            if "piece_size" in file_info:
+                piece_i = int(pos / file_info["piece_size"])
+                if not site.storage.piecefields[file_info["sha512"]][piece_i]:
+                    return False
         # Seek back to position we want to read
         file.seek(pos)
         return super(FileRequestPlugin, self).isReadable(site, inner_path, file, pos)