diff --git a/atst/models/workspace_user.py b/atst/models/workspace_user.py
index fb79ebbd..216b07aa 100644
--- a/atst/models/workspace_user.py
+++ b/atst/models/workspace_user.py
@@ -9,13 +9,6 @@ class WorkspaceUser(object):
         self.user = user
         self.workspace_role = workspace_role
 
-    def permissions(self):
-        atat_permissions = set(self.user.atat_role.permissions)
-        workspace_permissions = (
-            [] if self.workspace_role is None else self.workspace_role.role.permissions
-        )
-        return set(workspace_permissions).union(atat_permissions)
-
     @property
     def workspace(self):
         return self.workspace_role.workspace
diff --git a/tests/domain/test_workspace_users.py b/tests/domain/test_workspace_users.py
index 6e3aa710..4cea3970 100644
--- a/tests/domain/test_workspace_users.py
+++ b/tests/domain/test_workspace_users.py
@@ -1,6 +1,8 @@
 from atst.domain.workspace_users import WorkspaceUsers
 from atst.domain.users import Users
-from tests.factories import WorkspaceFactory, UserFactory
+from atst.models.invitation import Status as InvitationStatus
+
+from tests.factories import WorkspaceFactory, UserFactory, InvitationFactory
 
 
 def test_can_create_new_workspace_user():
@@ -34,3 +36,24 @@ def test_can_update_existing_workspace_user():
         workspace_users[0].workspace_role.role.name
         == new_user.workspace_roles[0].role.name
     )
+
+
+def test_workspace_user_permissions():
+    workspace_one = WorkspaceFactory.create()
+    workspace_two = WorkspaceFactory.create()
+    new_user = UserFactory.create()
+    WorkspaceUsers.add_many(
+        workspace_one.id, [{"id": new_user.id, "workspace_role": "developer"}]
+    )
+    WorkspaceUsers.add_many(
+        workspace_two.id, [{"id": new_user.id, "workspace_role": "developer"}]
+    )
+    InvitationFactory.create(
+        workspace=workspace_one,
+        user=new_user,
+        inviter=workspace_one.owner,
+        status=InvitationStatus.ACCEPTED,
+    )
+
+    assert WorkspaceUsers.workspace_user_permissions(workspace_one, new_user)
+    assert not WorkspaceUsers.workspace_user_permissions(workspace_two, new_user)