diff --git a/modules/services/webserver.nix b/modules/services/webserver.nix
index d8dbea0..1ce0bd3 100644
--- a/modules/services/webserver.nix
+++ b/modules/services/webserver.nix
@@ -65,9 +65,10 @@ in
           enableACME = true;
           http2 = true;
           acmeRoot = lib.mkIf cfg.acme.dnsChallenge null;
-          extraConfig = lib.mkIf (!proxyBuffering) ''
-            proxy_buffering off;
-          '';
+          extraConfig = lib.concatLines [
+            (lib.optionalString (!proxyBuffering) "proxy_buffering off;")
+            "charset utf-8;"
+          ];
           locations = lib.mapAttrs
             (_: { proxyPort, extraConfig }: lib.mergeAttrsList [
               { inherit extraConfig; }