diff --git a/build-aux/hydra/gnu-system.scm b/build-aux/hydra/gnu-system.scm
index 62eb957f83..654f3ecf3e 100644
--- a/build-aux/hydra/gnu-system.scm
+++ b/build-aux/hydra/gnu-system.scm
@@ -264,7 +264,8 @@ all its dependencies, and ready to be installed on non-GuixSD distributions.")
 
 (define job-name
   ;; Return the name of a package's job.
-  (compose string->symbol package-full-name))
+  (compose string->symbol
+           (cut package-full-name <> "-")))
 
 (define package->job
   (let ((base-packages