diff --git a/gnu/packages/python-web.scm b/gnu/packages/python-web.scm
index 42edafb25b..8d5af5bd46 100644
--- a/gnu/packages/python-web.scm
+++ b/gnu/packages/python-web.scm
@@ -4384,7 +4384,7 @@ (define-public python-flask-restful-swagger
     (build-system python-build-system)
     (arguments '(#:tests? #f))          ;no tests
     (propagated-inputs
-     (list python-flask-restful))
+     (list python-flask-restful python-six))
     (home-page "https://github.com/rantav/flask-restful-swagger")
     (synopsis "Extract Swagger specs from Flask-Restful projects")
     (description "This package lets you extract Swagger API documentation