diff --git a/rc/core/sh.kak b/rc/core/sh.kak
index 53a89ec8..517f6a18 100644
--- a/rc/core/sh.kak
+++ b/rc/core/sh.kak
@@ -7,7 +7,7 @@ add-highlighter shared/sh/code default-region group
 add-highlighter shared/sh/double_string region  %{(?<!\\)(?:\\\\)*\K"} %{(?<!\\)(?:\\\\)*"} group
 add-highlighter shared/sh/single_string region %{(?<!\\)(?:\\\\)*\K'} %{'} fill string
 add-highlighter shared/sh/comment region '(?<!\$)(?<!\$\{)#' '$' fill comment
-add-highlighter shared/sh/heredoc region -match-capture '<<-?(\w+)' '^\t*(\w+)$' fill string
+add-highlighter shared/sh/heredoc region -match-capture '<<-?''?(\w+)''?' '^\t*(\w+)$' fill string
 
 add-highlighter shared/sh/double_string/fill fill string