diff --git a/lisp/leim/quail/greek.el b/lisp/leim/quail/greek.el
index 107f4131e38..0829097af5f 100644
--- a/lisp/leim/quail/greek.el
+++ b/lisp/leim/quail/greek.el
@@ -1116,6 +1116,7 @@ nil t t nil nil nil nil nil nil nil t)
  ("'U" ?Ύ)
 
  ("`R" ?Ῥ)
+ ("(R" ?Ῥ)
 
  ("+`" ?῭) ; #x1fed
  ("+'" ?΅) ; #x1fee