diff --git a/include/wx/regex.h b/include/wx/regex.h
index e024d0e52a..8fb775da6d 100644
--- a/include/wx/regex.h
+++ b/include/wx/regex.h
@@ -20,6 +20,8 @@
 
 #if wxUSE_REGEX
 
+class WXDLLEXPORT wxString;
+
 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------