diff --git a/recoco/apps/home/management/commands/update_permissions.py b/recoco/apps/home/management/commands/update_permissions.py
index 06d710329..27930c6ee 100644
--- a/recoco/apps/home/management/commands/update_permissions.py
+++ b/recoco/apps/home/management/commands/update_permissions.py
@@ -16,23 +16,21 @@
 from recoco.apps.projects.models import Project, ProjectSwitchtender
 from recoco.apps.projects.utils import (
     assign_advisor,
-    assign_collaborator,
+    assign_collaborator_permissions,
     assign_observer,
 )
 from recoco.utils import get_group_for_site
 
 
 def assign_user_permissions_by_projects():
-    """Per project permission for user"""
+    """Per project permission for user."""
     for project in Project.objects.all():
         print("Updating perms for project:", project.name)
         for site in project.sites.all():
             print("\t* Updating permissions for collaborators...")
             with settings.SITE_ID.override(site.id):
                 for membership in project.projectmember_set.all():
-                    assign_collaborator(
-                        membership.member, project, is_owner=membership.is_owner
-                    )
+                    assign_collaborator_permissions(membership.member, project)
 
                 print("\t* Updating permissions for advisors/observers...")
                 print(f"\t== On site {site} ==")
@@ -63,7 +61,7 @@ def assign_user_permissions_by_projects():
 
 
 def assign_group_permissions_by_sites():
-    """Per site permissions for Group"""
+    """Per site permissions for Group."""
     for site in Site.objects.all():
         print("site:", site)
         with settings.SITE_ID.override(site.id):
diff --git a/recoco/apps/projects/utils.py b/recoco/apps/projects/utils.py
index 4c217a4d6..7ff52d3f7 100644
--- a/recoco/apps/projects/utils.py
+++ b/recoco/apps/projects/utils.py
@@ -25,11 +25,14 @@
 
 
 @transaction.atomic
-def assign_collaborator(user, project, is_owner=False):
-    """Make someone becomes a project collaborator and assign permissions"""
+def assign_collaborator_permissions(user, project):
+    """
+    Assign permissions to project collaborator.
 
+    If the project is still in draft (not accepted by moderators)
+    """
     permissions = models.COLLABORATOR_DRAFT_PERMISSIONS
-    if project.project_sites.origin().status != "DRAFT":
+    if project.project_sites.current().status != "DRAFT":
         permissions += models.COLLABORATOR_PERMISSIONS
 
     for perm in permissions:
@@ -39,6 +42,13 @@ def assign_collaborator(user, project, is_owner=False):
             print(f"Unable to find permission <{perm}>, aborting.")
             raise e
 
+
+@transaction.atomic
+def assign_collaborator(user, project, is_owner=False):
+    """Make someone becomes a project collaborator and assign permissions"""
+
+    assign_collaborator_permissions(user, project)
+
     # if we already have an owner, don't allow her to be replaced
     if is_owner:
         if (
diff --git a/recoco/apps/projects/views/__init__.py b/recoco/apps/projects/views/__init__.py
index a5f622067..71385029d 100644
--- a/recoco/apps/projects/views/__init__.py
+++ b/recoco/apps/projects/views/__init__.py
@@ -37,6 +37,7 @@
 from ..utils import (
     assign_advisor,
     assign_collaborator,
+    assign_collaborator_permissions,
     assign_observer,
     can_administrate_project,
     is_advisor_for_project,
@@ -159,8 +160,10 @@ def project_moderation_accept(request, project_pk):
                 # Invite her to fill in a new form
                 # Send an email to the project owner
 
-                # TODO: We should iterate over the collaborator list to assign them the
-                # project permission for this site (permisssion = COLLABORATOR)
+                # We assign permissions to use their project on this website in
+                # case of multiplication
+                for membership in project.projectmember_set.all():
+                    assign_collaborator_permissions(membership.member, project)
 
                 params = {
                     "project": digests.make_project_digest(project, owner),