diff --git a/app/utils.py b/app/utils.py
index 242af78dc..b5ab7f305 100644
--- a/app/utils.py
+++ b/app/utils.py
@@ -158,7 +158,7 @@ class Spreadsheet():
 
     @staticmethod
     def normalise_newlines(file_content):
-        return '\r\n'.join(file_content.getvalue().decode('utf-8').splitlines())
+        return '\r\n'.join(file_content.read().decode('utf-8').splitlines())
 
     @classmethod
     def from_rows(cls, rows, filename=''):