diff --git a/gnu/packages/python-check.scm b/gnu/packages/python-check.scm
index 558c14e9be7..f0ee561690e 100644
--- a/gnu/packages/python-check.scm
+++ b/gnu/packages/python-check.scm
@@ -623,6 +623,7 @@ counterexamples for you.")
      (list python-aiounittest
            python-pytest
            python-setuptools
+           python-six
            python-wheel))
     (propagated-inputs
      (list python-pyyaml))