diff --git a/src/convert/misc.h b/src/convert/misc.h
index ebc6cad..c46fae6 100644
--- a/src/convert/misc.h
+++ b/src/convert/misc.h
@@ -5,7 +5,7 @@
  */
 
 /*
- * Copyright (c) 2017-2022, Tomasz Sowa
+ * Copyright (c) 2017-2023, Tomasz Sowa
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -75,6 +75,7 @@ void esc_to_csv(const char * c, std::size_t len, pt::Stream & out);
 void esc_to_csv(const wchar_t * c, pt::Stream & out);
 void esc_to_csv(const wchar_t * c, size_t len, pt::Stream & out);
 void esc_to_csv(const std::string & in, Stream & out);
+void esc_to_csv(const std::wstring & in, Stream & out);