diff --git a/zilti/build/chicken-build-system.scm b/zilti/build/chicken-build-system.scm
index 7106867..b2ec0cb 100644
--- a/zilti/build/chicken-build-system.scm
+++ b/zilti/build/chicken-build-system.scm
@@ -18,6 +18,7 @@
 
 (define-module (zilti build chicken-build-system)
   #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module (guix build utils)
   #:use-module (ice-9 match)
   #:use-module (ice-9 ftw)
   #:use-module (srfi srfi-1)