diff --git a/gnu/packages/lisp-xyz.scm b/gnu/packages/lisp-xyz.scm
index 196e08306d..37a6e5a5ff 100644
--- a/gnu/packages/lisp-xyz.scm
+++ b/gnu/packages/lisp-xyz.scm
@@ -4366,9 +4366,7 @@ (define-public sbcl-xsubseq
         (base32 "1xz79q0p2mclf3sqjiwf6izdpb6xrsr350bv4mlmdlm6rg5r99px"))))
      (build-system asdf-build-system/sbcl)
      (arguments
-      ;; Tests fail with: Component XSUBSEQ-ASD::XSUBSEQ-TEST not found,
-      ;; required by #<SYSTEM "xsubseq">. Why?
-      '(#:tests? #f))
+      '(#:asd-systems '("xsubseq-test" "xsubseq")))
      (native-inputs
       (list sbcl-prove))
      (home-page "https://github.com/fukamachi/xsubseq")