diff --git a/tagvalue.h b/tagvalue.h
index 7b540d1..74c6a31 100644
--- a/tagvalue.h
+++ b/tagvalue.h
@@ -131,6 +131,8 @@ enum class TagDataType : unsigned int {
     DateTimeExpression, /**< date time expression, see CppUtilities::DateTimeExpression */
 };
 
+TAG_PARSER_EXPORT std::string_view tagDataTypeString(TagDataType dataType);
+
 /*!
  * \brief The TagValueComparisionOption enum specifies options for TagValue::compareTo().
  */