diff --git a/machines/fuuko/services/matrix/synapse.nix b/machines/fuuko/services/matrix/synapse.nix
index 90cad6e..ff98ff4 100644
--- a/machines/fuuko/services/matrix/synapse.nix
+++ b/machines/fuuko/services/matrix/synapse.nix
@@ -72,6 +72,8 @@ in
       disable_existing_loggers = false;
     };
 
+    max_upload_size = "50M";
+
     extraConfig = ''
       # I’m okay with using matrix.org as trusted key server
       suppress_key_server_warning: true
@@ -108,6 +110,10 @@ in
         in
         {
           proxyPass = "http://${listenerCfg.bind_address}:${toString listenerCfg.port}";
+
+          extraConfig = ''
+            client_max_body_size ${cfg.max_upload_size};
+          '';
         };
     };