diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index 755b0af4b6..6b5291d0e0 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -6355,7 +6355,7 @@ (define-public python-sshtunnel
            (lambda* (#:key tests? #:allow-other-keys)
              (when tests? (invoke "pytest" "-vv" "tests")))))))
     (propagated-inputs (list python-paramiko))
-    (native-inputs (list openssh python-pytest))
+    (native-inputs (list openssh python-pytest python-mock))
     (home-page "https://github.com/pahaz/sshtunnel")
     (synopsis "Python SSH tunnels library")
     (description "@code{sshtunnel} is a Python module for easily creating SSH