diff --git a/src/mergerfs_webui.cpp b/src/mergerfs_webui.cpp
index ebf85a99..dd681914 100644
--- a/src/mergerfs_webui.cpp
+++ b/src/mergerfs_webui.cpp
@@ -369,8 +369,7 @@ _post_kvs_key(const httplib::Request &req_,
           j["error"] = ::_generate_error(mount,key,val,rv);
         }
 
-      fmt::print(j.dump());
-      res_.set_content("",
+      res_.set_content(j.dump(),
                        "application/json");
 
     }