diff --git a/glicid/packages/clam.scm b/glicid/packages/clam.scm
index 9633719..71bb4ba 100644
--- a/glicid/packages/clam.scm
+++ b/glicid/packages/clam.scm
@@ -20,6 +20,7 @@
 #:use-module (gnu packages django)
 #:use-module (gnu packages time)
 #:use-module (gnu packages databases)
+#:use-module (gnu packages python-build) ;; setup-tools moved here.
 )
 
 (define-public python-pytest-runner-4.5.1