diff --git a/bash-abbr b/bash-abbr
index effbf2f..975b791 100644
--- a/bash-abbr
+++ b/bash-abbr
@@ -19,15 +19,13 @@ _control_op () {
                _bg_proc_or_and_and='[^&;]&&?' \
                _pipe_or_or_or='[^&|;]\|\|?' \
                _semicolon_or_case_operators='[^;|];;?&?' \
-               _opening_paren='[^[:alnum:]]\(' \
-               _closing_paren='\)'
+               _opening_paren='[^[:alnum:]]\('
     declare _control_op="^"
     _control_op+="|$_newline"
     _control_op+="|$_bg_proc_or_and_and"
     _control_op+="|$_pipe_or_or_or"
     _control_op+="|$_semicolon_or_case_operators"
     _control_op+="|$_opening_paren"
-    _control_op+="|$_closing_paren"
     printf %s "$_control_op"
 }
 _control_op="$(_control_op)"