1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/rest/media/v1/thumbnailer.py b/synapse/rest/media/v1/thumbnailer.py

index a65e9e1802..df54a40649 100644
--- a/synapse/rest/media/v1/thumbnailer.py
+++ b/synapse/rest/media/v1/thumbnailer.py
@@ -41,7 +41,7 @@ class Thumbnailer:
     FORMATS = {"image/jpeg": "JPEG", "image/png": "PNG"}
 
     @staticmethod
-    def set_limits(max_image_pixels: int):
+    def set_limits(max_image_pixels: int) -> None:
         Image.MAX_IMAGE_PIXELS = max_image_pixels
 
     def __init__(self, input_path: str):