diff --git a/app/controllers/aaManager.py b/app/controllers/aaManager.py
index c1de3fd..d75c83c 100644
--- a/app/controllers/aaManager.py
+++ b/app/controllers/aaManager.py
@@ -59,7 +59,7 @@ def unassign_accessauth(*, db: Session = Depends(get_session), group_id: int, aa
     if db_aa is None:
         raise HTTPException(status_code=404, detail="AA not found")
     if db_aa not in db_group.accessauths:
-        raise HTTPException(status_code=200, detail="AA not assigned to group")
+        raise HTTPException(status_code=404, detail="AA not assigned to group")
     db_group.accessauths.remove(db_aa)
     return add_and_refresh(db, db_group)
 
diff --git a/test/test_services/test_aa_manager.py b/test/test_services/test_aa_manager.py
index 292397f..25a8f04 100644
--- a/test/test_services/test_aa_manager.py
+++ b/test/test_services/test_aa_manager.py
@@ -99,8 +99,7 @@ def test_unassign_nonexistent_assignment(client, auth_headers, test_group, test_
         f"/aa/unassign/{test_group.id}/{test_aa.id}", 
         headers=auth_headers
     )
-    # According to the code, this returns 200 with "not assigned" message
-    assert response.status_code == 200
+    assert response.status_code == 404
 
 
 def test_assign_to_nonexistent_group(client, auth_headers, test_aa):