diff --git a/gnu/packages/lisp-xyz.scm b/gnu/packages/lisp-xyz.scm
index 1bd35d5812..2e95d5c694 100644
--- a/gnu/packages/lisp-xyz.scm
+++ b/gnu/packages/lisp-xyz.scm
@@ -17471,3 +17471,9 @@ (define-public sbcl-stmx
 bugs and race conditions, provide automatic roll-back on failure, and aim at
 resolving the tension between granularity and concurrency.")
      (license license:llgpl))))
+
+(define-public ecl-stmx
+  (sbcl-package->ecl-package sbcl-stmx))
+
+(define-public cl-stmx
+  (sbcl-package->cl-source-package sbcl-stmx))