diff --git a/lib/configure.py b/lib/configure.py
index 99b04e5531..cc6be7bfa4 100644
--- a/lib/configure.py
+++ b/lib/configure.py
@@ -1331,6 +1331,7 @@ def removeTempFiles():
 if __name__ == '__main__':
     lyx_check_config = True
     outfile = 'lyxrc.defaults'
+    lyxrc_fileformat = 1
     rc_entries = ''
     lyx_keep_temps = False
     version_suffix = ''
@@ -1372,7 +1373,10 @@ Options:
 # want to customize LyX, use LyX' Preferences dialog or modify directly 
 # the "preferences" file instead. Any setting in that file will
 # override the values given here.
-''')
+
+Format %i
+
+''' % lyxrc_fileformat)
     # check latex
     LATEX = checkLatex(dtl_tools)
     checkFormatEntries(dtl_tools)