diff --git a/gnu/packages/commencement.scm b/gnu/packages/commencement.scm
index 9e3cecc174..d4cf58a7eb 100644
--- a/gnu/packages/commencement.scm
+++ b/gnu/packages/commencement.scm
@@ -266,6 +266,7 @@
                       ,(origin
                          (method url-fetch)
                          (uri (string-append "http://git.savannah.gnu.org/cgit/guile.git/plain/module/system/base/lalr.upstream.scm?h=v2.0.9"))
+                         (file-name "lalr.upstream.scm")
                          (sha256
                           (base32
                            "0h7gyjj8nr2qrgzwma146s7l22scp8bbcqzdy9wqf12bgyhbw7d5"))))))