diff --git a/src/mergerfs_webui.cpp b/src/mergerfs_webui.cpp
index 74214081..207a6f9c 100644
--- a/src/mergerfs_webui.cpp
+++ b/src/mergerfs_webui.cpp
@@ -217,8 +217,10 @@ _get_kv(const httplib::Request &req_,
     }
 
   json j;
+  std::string key;
   std::string mount;
 
+  key   = req_.path_params.at("key");
   mount = req_.get_param_value("mount");
 
   mergerfs::api::get_kvs(mount,&kvs);