diff --git a/roles/installer/templates/execution_environments.py.j2 b/roles/installer/templates/execution_environments.py.j2
index 31b17e42..b1a4d42f 100644
--- a/roles/installer/templates/execution_environments.py.j2
+++ b/roles/installer/templates/execution_environments.py.j2
@@ -1,5 +1,5 @@
 DEFAULT_EXECUTION_ENVIRONMENTS = [
 {% for item in tower_ee_images %}
-    {'name': '{{ item.name }}' , 'image': '{{ item.image }}'}
+    {'name': '{{ item.name }}' , 'image': '{{ item.image }}'},
 {% endfor %}
 ]