diff --git a/guix/import/stackage.scm b/guix/import/stackage.scm
index 00814c7d46..f801835b33 100644
--- a/guix/import/stackage.scm
+++ b/guix/import/stackage.scm
@@ -92,7 +92,7 @@ (define (lts-package-version packages name)
   "Return the version of the package with upstream NAME included in PACKAGES."
   (let ((pkg (find (lambda (pkg) (string=? (stackage-package-name pkg) name))
                    packages)))
-    (stackage-package-version pkg)))
+    (and=> pkg stackage-package-version)))
 
 
 ;;;