diff --git a/tasks/molteniron_install.yml b/tasks/molteniron_install.yml
index 82c20eb..f6026c7 100644
--- a/tasks/molteniron_install.yml
+++ b/tasks/molteniron_install.yml
@@ -42,6 +42,7 @@
     name: "{{ molteniron_requires_pip_packages | join(' ') }}"
     state: "{{ molteniron_package_state }}"
     extra_args: >-
+      {{ molteniron_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('') }}
   register: install_packages
@@ -93,7 +94,7 @@
     virtualenv: "{{ molteniron_bin | dirname }}"
     virtualenv_site_packages: "no"
     extra_args: >-
-      {{ molteniron_developer_mode | ternary('--constraint /opt/developer-pip-constraints.txt', '') }}
+      {{ molteniron_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('') }}
   register: install_packages