diff --git a/headers/os/interface/TextView.h b/headers/os/interface/TextView.h
index a4e78a79c6..80edc7fc2e 100644
--- a/headers/os/interface/TextView.h
+++ b/headers/os/interface/TextView.h
@@ -410,6 +410,9 @@ private:
 
 			void				_ShowContextMenu(BPoint where);
 
+			void				_FilterDisallowedChars(char* text, int32& len,
+								text_run_array* runArray);
+
 private:
 			BPrivate::TextGapBuffer*	fText;
 			LineBuffer*			fLines;