diff --git a/glass/src/libnt/native/cpp/NetworkTables.cpp b/glass/src/libnt/native/cpp/NetworkTables.cpp
index d661ee5f05..ff7d6ff5a6 100644
--- a/glass/src/libnt/native/cpp/NetworkTables.cpp
+++ b/glass/src/libnt/native/cpp/NetworkTables.cpp
@@ -360,7 +360,7 @@ static void UpdateProtobufValueSource(NetworkTablesModel& model,
                                       const google::protobuf::Message& msg,
                                       std::string_view name, int64_t time) {
   auto desc = msg.GetDescriptor();
-  out->typeStr = "proto:" + desc->full_name();
+  out->typeStr = fmt::format("proto:{}", desc->full_name());
   if (!out->valueChildrenMap ||
       desc->field_count() != static_cast<int>(out->valueChildren.size())) {
     out->valueChildren.clear();