diff --git a/backend/src/openarchiefbeheer/zaken/api/filtersets.py b/backend/src/openarchiefbeheer/zaken/api/filtersets.py
index b643d8e8..4475f786 100644
--- a/backend/src/openarchiefbeheer/zaken/api/filtersets.py
+++ b/backend/src/openarchiefbeheer/zaken/api/filtersets.py
@@ -11,6 +11,18 @@
 from ..models import Zaak
 
 
+class ExpandFilter(CharFilter):
+    """
+    Custom filter looking for `field_name` and `lookup_expr` within _expand.
+    """
+
+    def filter(self, qs, value):
+        if value:
+            lookup = f"_expand__{self.field_name}__{self.lookup_expr}"
+            qs = qs.filter(**{lookup: value})
+        return qs
+
+
 class ZaakFilter(FilterSet):
     not_in_destruction_list = BooleanFilter(
         field_name="not_in_destruction_list",
@@ -49,6 +61,10 @@ class ZaakFilter(FilterSet):
         ),
     )
 
+    zaaktype__omschrijving__icontains = ExpandFilter(
+        field_name="zaaktype__omschrijving", lookup_expr="icontains"
+    )
+
     class Meta:
         model = Zaak
         fields = {
diff --git a/backend/src/openarchiefbeheer/zaken/tests/factories.py b/backend/src/openarchiefbeheer/zaken/tests/factories.py
index 41a17602..85f22f8e 100644
--- a/backend/src/openarchiefbeheer/zaken/tests/factories.py
+++ b/backend/src/openarchiefbeheer/zaken/tests/factories.py
@@ -27,6 +27,7 @@ class Params:
                 "zaaktype": {
                     "url": "http://catalogue-api.nl/zaaktypen/111-111-111",
                     "selectielijst_procestype": {"nummer": 1},
+                    "omschrijving": "Aangifte behandelen",
                 },
                 "resultaat": {
                     "resultaattype": "http://catalogue-api.nl/catalogi/api/v1/resultaattypen/111-111-111",
diff --git a/backend/src/openarchiefbeheer/zaken/tests/test_viewsets.py b/backend/src/openarchiefbeheer/zaken/tests/test_viewsets.py
index 34086979..8a3b8ceb 100644
--- a/backend/src/openarchiefbeheer/zaken/tests/test_viewsets.py
+++ b/backend/src/openarchiefbeheer/zaken/tests/test_viewsets.py
@@ -238,17 +238,18 @@ def test_filter_heeft_relaties(self):
 
     def test_partial_filter(self):
         ZaakFactory.create(identificatie="ZAAK-ABCDEF-01")
-        ZaakFactory.create(identificatie="ZAAK-ABC-02")
+        ZaakFactory.create(identificatie="ZAAK-ABC-02", with_expand=True)
         ZaakFactory.create(identificatie="ZAAK-BCDEF-02")
 
         user = UserFactory(username="record_manager", role__can_start_destruction=True)
 
         endpoint = furl(reverse("api:zaken-list"))
         endpoint.args["identificatie__icontains"] = "ABC"
+        endpoint.args["zaaktype__omschrijving__icontains"] = "Aangifte behandelen"
 
         self.client.force_authenticate(user)
         response = self.client.get(endpoint.url)
         data = response.json()
 
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        self.assertEqual(data["count"], 2)
+        self.assertEqual(data["count"], 1)