1 files changed, 2 insertions, 2 deletions
diff --git a/synapse/rest/media/v1/preview_url_resource.py b/synapse/rest/media/v1/preview_url_resource.py
index a23d6f5c75..fb0d02aa83 100644
--- a/synapse/rest/media/v1/preview_url_resource.py
+++ b/synapse/rest/media/v1/preview_url_resource.py
@@ -77,8 +77,8 @@ class PreviewUrlResource(DirectServeResource):
             treq_args={"browser_like_redirects": True},
             ip_whitelist=hs.config.url_preview_ip_range_whitelist,
             ip_blacklist=hs.config.url_preview_ip_range_blacklist,
-            http_proxy=os.getenv("http_proxy"),
-            https_proxy=os.getenv("HTTPS_PROXY"),
+            http_proxy=os.getenvb(b"http_proxy"),
+            https_proxy=os.getenvb(b"HTTPS_PROXY"),
         )
         self.media_repo = media_repo
         self.primary_base_path = media_repo.primary_base_path