diff --git a/guix/import/pypi.scm b/guix/import/pypi.scm
index 56854ff96c..f908136481 100644
--- a/guix/import/pypi.scm
+++ b/guix/import/pypi.scm
@@ -426,7 +426,7 @@ (define (make-pypi-sexp name version source-url wheel-url home-page synopsis
   "Return the `package' s-expression for a python package with the given NAME,
 VERSION, SOURCE-URL, HOME-PAGE, SYNOPSIS, DESCRIPTION, and LICENSE."
   (define (maybe-upstream-name name)
-    (if (string-match ".*\\-[0-9]+" (pk name))
+    (if (string-match ".*\\-[0-9]+" name)
         `((properties ,`'(("upstream-name" . ,name))))
         '()))