diff --git a/indent/haml.vim b/indent/haml.vim
index 7613fae..b97e13b 100644
--- a/indent/haml.vim
+++ b/indent/haml.vim
@@ -14,6 +14,8 @@ setlocal autoindent
 setlocal indentexpr=GetHamlIndent()
 setlocal indentkeys=o,O,*<Return>,},],0),!^F,=end,=else,=elsif,=rescue,=ensure,=when
 
+let b:undo_indent = "setl ai< inde< indk<"
+
 " Only define the function once.
 if exists("*GetHamlIndent")
   finish
diff --git a/indent/sass.vim b/indent/sass.vim
index d6dbf3a..d337af0 100644
--- a/indent/sass.vim
+++ b/indent/sass.vim
@@ -12,6 +12,8 @@ setlocal autoindent sw=2 et
 setlocal indentexpr=GetSassIndent()
 setlocal indentkeys=o,O,*<Return>,<:>,!^F
 
+let b:undo_indent = "setl ai< inde< indk<"
+
 " Only define the function once.
 if exists("*GetSassIndent")
   finish