diff --git a/nixos/modules/services/web-servers/h2o/default.nix b/nixos/modules/services/web-servers/h2o/default.nix
index 042fbea41be9..5470748911f8 100644
--- a/nixos/modules/services/web-servers/h2o/default.nix
+++ b/nixos/modules/services/web-servers/h2o/default.nix
@@ -100,7 +100,7 @@ in
       package = lib.mkPackageOption pkgs "h2o" {
         example = ''
           pkgs.h2o.override {
-            withMruby = true;
+            withMruby = false;
           };
         '';
       };