diff --git a/src/pretix/base/services/shredder.py b/src/pretix/base/services/shredder.py
index e0e38572f0..f174a0b58e 100644
--- a/src/pretix/base/services/shredder.py
+++ b/src/pretix/base/services/shredder.py
@@ -54,7 +54,7 @@ def export(event: Event, shredders: List[str]) -> None:
         cf = CachedFile()
         cf.date = now()
         cf.filename = event.slug + '.zip'
-        cf.type = 'application/pdf'
+        cf.type = 'application/zip'
         cf.expires = now() + timedelta(hours=1)
         cf.save()
         cf.file.save(cachedfile_name(cf, cf.filename), rawfile)