diff --git a/tesseract_common/include/tesseract_common/serialization.h b/tesseract_common/include/tesseract_common/serialization.h
index f86a22f07f8..5c1becbcad4 100644
--- a/tesseract_common/include/tesseract_common/serialization.h
+++ b/tesseract_common/include/tesseract_common/serialization.h
@@ -113,7 +113,7 @@ struct Serialization
   {
     fs::path fp(file_path);
     if (!fp.has_extension())
-      fp.append(".").append(serialization::xml::extension<SerializableType>::value);
+      fp = fs::path(file_path + "." + serialization::xml::extension<SerializableType>::value);
 
     std::ofstream os(fp.string());
     {  // Must be scoped because all data is not written until the oost::archive::xml_oarchive goes out of scope
@@ -138,7 +138,7 @@ struct Serialization
   {
     fs::path fp(file_path);
     if (!fp.has_extension())
-      fp.append(".").append(serialization::binary::extension<SerializableType>::value);
+      fp = fs::path(file_path + "." + serialization::binary::extension<SerializableType>::value);
 
     std::ofstream os(fp.string(), std::ios_base::binary);
     {  // Must be scoped because all data is not written until the oost::archive::xml_oarchive goes out of scope