Update runtime files.
diff --git a/runtime/syntax/clojure.vim b/runtime/syntax/clojure.vim
index 2b48146..ffdd5c2 100644
--- a/runtime/syntax/clojure.vim
+++ b/runtime/syntax/clojure.vim
@@ -136,7 +136,7 @@
syntax match clojureRegexpQuantifier "[?*+][?+]\=" contained display
syntax match clojureRegexpQuantifier "\v\{\d+%(,|,\d+)?}\??" contained display
syntax match clojureRegexpOr "|" contained display
-syntax match clojureRegexpBackRef "\v\\%([1-9]\d*|k\<[a-zA-z]+\>)" contained display
+syntax match clojureRegexpBackRef "\v\\%([1-9]\d*|k\<[a-zA-Z]+\>)" contained display
" Mode modifiers, mode-modified spans, lookaround, regular and atomic
" grouping, and named-capturing.