diff --git a/plugin/indent_guides.vim b/plugin/indent_guides.vim
index f375d4b..72e2f7b 100644
--- a/plugin/indent_guides.vim
+++ b/plugin/indent_guides.vim
@@ -19,8 +19,21 @@ command! IndentGuidesEnable  call s:IndentGuidesEnable()
 command! IndentGuidesDisable call s:IndentGuidesDisable()
 
 " Default options
-let g:indent_guides_indent_levels = 50
-let g:indent_guides_debug         = 0
+let g:indent_guides_indent_levels =
+  \ exists('g:indent_guides_indent_levels') ?
+  \ g:indent_guides_indent_levels : 50
+
+let g:indent_guides_debug =
+  \ exists('g:indent_guides_debug') ?
+  \ g:indent_guides_debug : 0
+
+let g:indent_guides_auto_colors =
+  \ exists('g:indent_guides_auto_colors') ?
+  \ g:indent_guides_auto_colors : 1
+
+let g:indent_guides_auto_colors_change_percent =
+  \ exists('g:indent_guides_auto_colors_change_percent') ?
+  \ g:indent_guides_auto_colors_change_percent : 0.20
 
 " Default mapping
 nmap <Leader>ig :IndentGuidesToggle<CR>