diff --git a/include/wx/textbuf.h b/include/wx/textbuf.h
index fae3b12095..a5d39703ca 100644
--- a/include/wx/textbuf.h
+++ b/include/wx/textbuf.h
@@ -172,7 +172,7 @@ protected:
     // -----
 
     // default ctor, use Open(string)
-    wxTextBuffer() { m_isOpened = false; }
+    wxTextBuffer() { m_nCurLine = 0; m_isOpened = false; }
 
     // ctor from filename
     wxTextBuffer(const wxString& strBufferName);