diff --git a/defaults/main.yml b/defaults/main.yml
index 852c0093..af295908 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -448,6 +448,9 @@ keystone_pip_packages:
   - uWSGI
   - pyngus
 
+# Specific pip packages provided by the user
+keystone_user_pip_packages: []
+
 # optional pip packages
 keystone_optional_oslomsg_amqp1_pip_packages:
   - oslo.messaging[amqp1]
diff --git a/tasks/keystone_install_source.yml b/tasks/keystone_install_source.yml
index a09c958a..53c573ba 100644
--- a/tasks/keystone_install_source.yml
+++ b/tasks/keystone_install_source.yml
@@ -43,7 +43,7 @@
     venv_install_destination_path: "{{ keystone_bin | dirname }}"
     venv_pip_install_args: "{{ keystone_pip_install_args }}"
     venv_pip_packages: >-
-      {{ keystone_pip_packages +
+      {{ keystone_pip_packages | union(keystone_user_pip_packages) +
          (keystone_oslomsg_amqp1_enabled | bool) | ternary(keystone_optional_oslomsg_amqp1_pip_packages, []) }}
     venv_facts_when_changed:
       - section: "keystone"