diff --git a/colors/pencil.vim b/colors/pencil.vim
index 32eb518..c08f33e 100644
--- a/colors/pencil.vim
+++ b/colors/pencil.vim
@@ -184,10 +184,10 @@ call s:h("DiffText",      {"fg": s:dark_blue})
 call s:h("SignColumn",    {"fg": s:light_green})
 " hi Conceal
 if has("gui_running")
-  call s:h("SpellBad",    {"gui": "undercurl", "guisp": s.red})
-  call s:h("SpellCap",    {"gui": "undercurl", "guisp": s.light_green})
-  call s:h("SpellRare",   {"gui": "undercurl", "guisp": s.pink})
-  call s:h("SpellLocal",  {"gui": "undercurl", "guisp": s.dark_green})
+  call s:h("SpellBad",    {"gui": "undercurl", "guisp": s:red})
+  call s:h("SpellCap",    {"gui": "undercurl", "guisp": s:light_green})
+  call s:h("SpellRare",   {"gui": "undercurl", "guisp": s:pink})
+  call s:h("SpellLocal",  {"gui": "undercurl", "guisp": s:dark_green})
 else
   call s:h("SpellBad",    {"cterm": "underline", "fg": s:red})
   call s:h("SpellCap",    {"cterm": "underline", "fg": s:light_green})