diff --git a/contrib/mergetools.hgrc b/contrib/mergetools.hgrc
--- a/contrib/mergetools.hgrc
+++ b/contrib/mergetools.hgrc
@@ -51,7 +51,7 @@ filemerge.executable=/Developer/Applicat
 filemerge.args=-left $other -right $local -ancestor $base -merge $output
 filemerge.gui=True
 
-beyondcompare3.args=$local $other $base $output /ro /lefttitle=local /centerfile=base /righttitle=other /automerge /reviewconflicts /solo
+beyondcompare3.args=$local $other $base $output /ro /lefttitle=local /centertitle=base /righttitle=other /automerge /reviewconflicts /solo
 beyondcompare3.regkey=Software\Scooter Software\Beyond Compare 3
 beyondcompare3.regname=ExePath
 beyondcompare3.gui=True