diff --git a/indent/haskell.vim b/indent/haskell.vim
index 1cb8435..eaff0c9 100644
--- a/indent/haskell.vim
+++ b/indent/haskell.vim
@@ -2,7 +2,7 @@
 " Filename: indent/haskell.vim
 " Author: itchyny
 " License: MIT License
-" Last Change: 2024/11/01 20:51:18.
+" Last Change: 2025/03/03 09:45:31.
 " =============================================================================
 
 if exists('b:did_indent')
@@ -128,7 +128,7 @@ function! GetHaskellIndent() abort
   endif
 
   if nonblankline =~# '\v<do>\s*[[:alnum:](]'
-    return match(nonblankline, '\v<do>\s*\zs\S')
+    return match(nonblankline, '\v.*<do>\s*\zs')
   endif
 
   if line =~# '\v<if>' && line !~# '\v^\s*#'
diff --git a/test/do/double_do.in.hs b/test/do/double_do.in.hs
new file mode 100644
index 0000000..1b9f783
--- /dev/null
+++ b/test/do/double_do.in.hs
@@ -0,0 +1,3 @@
+do foo <- do undo <- baz
+qux
+quux
diff --git a/test/do/double_do.out.hs b/test/do/double_do.out.hs
new file mode 100644
index 0000000..b400314
--- /dev/null
+++ b/test/do/double_do.out.hs
@@ -0,0 +1,3 @@
+do foo <- do undo <- baz
+             qux
+             quux