diff --git a/lisp/leim/quail/greek.el b/lisp/leim/quail/greek.el
index 107f4131e38..714224040ae 100644
--- a/lisp/leim/quail/greek.el
+++ b/lisp/leim/quail/greek.el
@@ -1115,7 +1115,7 @@ "greek-ibycus4"
  ("`U" ?Ὺ)
  ("'U" ?Ύ)
 
- ("`R" ?Ῥ)
+ ("(R" ?Ῥ)
 
  ("+`" ?῭) ; #x1fed
  ("+'" ?΅) ; #x1fee