diff --git a/web/tfm_web.py b/web/tfm_web.py
index d6033ee..41c04e9 100644
--- a/web/tfm_web.py
+++ b/web/tfm_web.py
@@ -434,7 +434,7 @@ def thumb(file_id=None):
 			raise RuntimeError("File does not exist")
 		return send_file(
 			tfm_api.previewer.get_jpeg_preview(join(tfm_api.conf["Paths"]["Files"], file_id), height=160, width=160),
-			mimetype=file["mime_name"]
+			mimetype="image/jpeg"
 		)
 	except:
 		abort(404)
@@ -453,7 +453,7 @@ def preview(file_id=None):
 			raise RuntimeError("File does not exist")
 		return send_file(
 			tfm_api.previewer.get_jpeg_preview(join(tfm_api.conf["Paths"]["Files"], file_id), height=1080, width=1920),
-			mimetype=file["mime_name"]
+			mimetype="image/jpeg"
 		)
 	except:
 		abort(404)