diff --git a/tests/test-swift-functional.yml b/tests/test-swift-functional.yml
index c2b5acf5..77025261 100644
--- a/tests/test-swift-functional.yml
+++ b/tests/test-swift-functional.yml
@@ -106,6 +106,7 @@
       virtualenv: "{{ swift_venv_bin | dirname }}"
       extra_args: >-
         {{ swift_developer_mode | ternary(pip_install_developer_constraints | default('--constraint /opt/developer-pip-constraints.txt'), '') }}
+        {{ (pip_install_upper_constraints is defined) | ternary('--constraint ' + pip_install_upper_constraints | default(''),'') }}
         {{ pip_install_options | default('') }}
     with_items:
       - "/opt/swift/test-requirements.txt"