diff --git a/include/wx/stc/private.h b/include/wx/stc/private.h
index 3624bb779f..f48a037894 100644
--- a/include/wx/stc/private.h
+++ b/include/wx/stc/private.h
@@ -28,7 +28,7 @@ extern wxCharBuffer wx2stc(const wxString& str);
 // just to compute the length.
 inline size_t wx2stclen(const wxString& WXUNUSED(str), const wxCharBuffer& buf)
 {
-    return buf.length() - 1;
+    return buf.length();
 }
 
 #else // not UNICODE