diff --git a/oni-elisp/oni-elisp.el b/oni-elisp/oni-elisp.el
index a9d34ed..9eb62d5 100644
--- a/oni-elisp/oni-elisp.el
+++ b/oni-elisp/oni-elisp.el
@@ -4,7 +4,7 @@
 
 ;; Author: Tom Willemse <tom@ryuslash.org>
 ;; Keywords: local
-;; Version: 2021.0227.150704
+;; Version: 2021.0509.010120
 ;; Package-Requires: (oni-company oni-flycheck oni-paredit oni-fci oni-yasnippet oni-hydra rainbow-delimiters nameless erefactor flycheck-relint handle elisp-format)
 
 ;; This program is free software; you can redistribute it and/or modify
@@ -52,7 +52,8 @@
  `((,(rx symbol-start
          (group (or "t"
                     "nil"
-                    (and digit
+                    (and (optional "-")
+                         digit
                          (minimal-match (zero-or-more (any digit ?.))))))
          symbol-end)
     1 font-lock-constant-face)))