diff --git a/gnu/packages/check.scm b/gnu/packages/check.scm
index 08e390840c..63ed2175ef 100644
--- a/gnu/packages/check.scm
+++ b/gnu/packages/check.scm
@@ -430,6 +430,7 @@ (define-public cmdtest
               (uri (git-reference
                     (url "git://git.liw.fi/cmdtest/")
                     (commit version)))
+              (file-name (git-file-name name version))
               (sha256
                (base32
                 "1yhcwsqcpckkq5kw3h07k0xg6infyiyzq9ni3nqphrzxis7hxjf1"))))