diff --git a/gnu/packages/python-web.scm b/gnu/packages/python-web.scm
index 23ea2edb20..980b0b302e 100644
--- a/gnu/packages/python-web.scm
+++ b/gnu/packages/python-web.scm
@@ -2876,8 +2876,6 @@ (define-public python-flask-wtf
        (modify-phases %standard-phases
          (replace 'check
            (lambda _
-             (setenv "PYTHONPATH" (string-append "./build/lib:"
-                                                 (getenv "PYTHONPATH")))
              (invoke "pytest" "-vv"))))))
     (propagated-inputs
      `(("python-flask-babel" ,python-flask-babel)