diff --git a/wpiutil/src/main/native/cpp/struct/DynamicStruct.cpp b/wpiutil/src/main/native/cpp/struct/DynamicStruct.cpp
index 28e61dacd1..120590d5f4 100644
--- a/wpiutil/src/main/native/cpp/struct/DynamicStruct.cpp
+++ b/wpiutil/src/main/native/cpp/struct/DynamicStruct.cpp
@@ -199,6 +199,7 @@ const StructDescriptor* StructDescriptorDatabase::Add(std::string_view name,
           .first->second;
   theStruct.m_schema = schema;
   theStruct.m_fields.clear();
+  theStruct.m_fieldsByName.clear();
   theStruct.m_fields.reserve(parsed.declarations.size());
   bool isValid = true;
   for (auto&& decl : parsed.declarations) {