diff --git a/apps/participation/management/commands/fix_matrix_channels.py b/apps/participation/management/commands/fix_matrix_channels.py
index 764b41e..ec7802b 100644
--- a/apps/participation/management/commands/fix_matrix_channels.py
+++ b/apps/participation/management/commands/fix_matrix_channels.py
@@ -16,10 +16,8 @@ class Command(BaseCommand):
             if not os.path.isfile(".matrix_avatar"):
                 stat_file = os.stat("corres2math/static/logo.png")
                 with open("corres2math/static/logo.png", "rb") as f:
-                    resp, _ = Matrix.upload(f, filename="logo.png", content_type="image/png",
-                                            filesize=stat_file.st_size)
-                if not hasattr(resp, "content_uri"):
-                    raise Exception(resp)
+                    resp = Matrix.upload(f, filename="logo.png", content_type="image/png",
+                                            filesize=stat_file.st_size)[0][0]
                 avatar_uri = resp.content_uri
                 with open(".matrix_avatar", "w") as f:
                     f.write(avatar_uri)