diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index 4f20396a75..7e667ef7e1 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -27595,6 +27595,8 @@ (define-public python-parallel
          "1mzk4yabxj6r149fswhis18hd8dnag5sj8i4wb06450zq3pi8dh7"))))
     (native-inputs
      (list unzip))
+    (propagated-inputs
+     (list python-six))
     (build-system python-build-system)
     (arguments '(#:tests? #f))  ; No test suite.
     (home-page "https://www.parallelpython.com")