diff --git a/backend.py b/backend.py
index e08ec47..3466393 100644
--- a/backend.py
+++ b/backend.py
@@ -253,6 +253,7 @@ class CalibreDB:
                             lossless=self.webp_config['lossless']
                         )
 
+                        page_data.seek(0)
                         disk_cache.set(f'{volume_id}-{page_number}', page_data)
                         page_data.seek(0)
             else: