diff --git a/src/mergerfs_webui.cpp b/src/mergerfs_webui.cpp
index 5ddfca08..4feced27 100644
--- a/src/mergerfs_webui.cpp
+++ b/src/mergerfs_webui.cpp
@@ -254,7 +254,8 @@ _post_kvs(const httplib::Request &req_,
 
       for(const auto &[key,val] : j.items())
         {
-          std::cout << "mount=" << mount << " | " << key << ": " << val.string() << std::endl;
+          std::cout << "mount=" << mount << " | "
+                    << key << ": " << (std::string)val << std::endl;
         }
 
       res_.set_content("{}", "application/json");