diff --git a/clim-tos.asd b/clim-tos.asd
index 1ea17ab157eb7afc92cc0042ea88ca1e7fc813a3..ff2696434b4c60583a29d385e7662c0b3cec53fc 100644
--- a/clim-tos.asd
+++ b/clim-tos.asd
@@ -99,7 +99,9 @@
 
 ;;; based on `clim-utils'
 (defsystem #:clim-tos/utils
-  :depends-on (#:closer-mop #:trivial-gray-streams)
+  :depends-on (#:closer-mop
+               #:trivial-gray-streams
+               #:bordeaux-threads)
   :components
   ((:module "utils"
             :components ((:file "packages")