diff --git a/openedx_tagging/core/tagging/rest_api/v1/views.py b/openedx_tagging/core/tagging/rest_api/v1/views.py
index 743f5bcd2..63754d38f 100644
--- a/openedx_tagging/core/tagging/rest_api/v1/views.py
+++ b/openedx_tagging/core/tagging/rest_api/v1/views.py
@@ -166,6 +166,7 @@ class TaxonomyView(ModelViewSet):
 
     """
 
+    lookup_value_regex = r"\d+"
     serializer_class = TaxonomySerializer
     permission_classes = [TaxonomyObjectPermissions]
 
diff --git a/tests/openedx_tagging/core/tagging/test_views.py b/tests/openedx_tagging/core/tagging/test_views.py
index d97296ba0..07816eed4 100644
--- a/tests/openedx_tagging/core/tagging/test_views.py
+++ b/tests/openedx_tagging/core/tagging/test_views.py
@@ -195,6 +195,13 @@ def test_detail_taxonomy_404(self) -> None:
         response = self.client.get(url)
         assert response.status_code == status.HTTP_404_NOT_FOUND
 
+    def test_detail_taxonomy_invalud_pk(self) -> None:
+        url = TAXONOMY_DETAIL_URL.format(pk="invalid")
+
+        self.client.force_authenticate(user=self.staff)
+        response = self.client.get(url)
+        assert response.status_code == status.HTTP_404_NOT_FOUND
+
     @ddt.data(
         (None, status.HTTP_401_UNAUTHORIZED),
         ("user", status.HTTP_403_FORBIDDEN),