diff --git a/indent/haskell.vim b/indent/haskell.vim
index 54f244a..f186fef 100644
--- a/indent/haskell.vim
+++ b/indent/haskell.vim
@@ -2,7 +2,7 @@
 " Filename: indent/haskell.vim
 " Author: itchyny
 " License: MIT License
-" Last Change: 2023/11/07 19:40:39.
+" Last Change: 2024/08/04 14:20:20.
 " =============================================================================
 
 if exists('b:did_indent')
@@ -471,6 +471,8 @@ function! s:indent_bar() abort
       return match(line, '\v^\s*%(<where>)?.*[^|]\zs\|[^|].*\=')
     elseif line =~# '\v<data>.*\='
       return match(line, '\v^.*<data>.*\zs\=')
+    elseif line =~# '\v<if>\s*\|'
+      return match(line, '\v<if>\s*\zs\|')
     elseif line =~# '\v^\s*<where>\s*%(--.*)?$' && indent(i) < indent || line =~# '^\S'
       return indent + &shiftwidth
     elseif line =~# '\v^\s*<where>\s+\S'