diff --git a/src/registrar/admin.py b/src/registrar/admin.py
index c9eea460d..c9107969a 100644
--- a/src/registrar/admin.py
+++ b/src/registrar/admin.py
@@ -486,7 +486,7 @@ class MyUserAdmin(BaseUserAdmin):
         field_name = request_get.get("field_name", None)
 
         # Make sure we're only modifying requests from these models.
-        models_to_target = {"DomainRequest"}
+        models_to_target = {"domain_request"}
         if model_name in models_to_target:
             # Define rules per field
             match field_name:
diff --git a/src/registrar/tests/test_admin.py b/src/registrar/tests/test_admin.py
index 013000fb2..ec9c1e7d3 100644
--- a/src/registrar/tests/test_admin.py
+++ b/src/registrar/tests/test_admin.py
@@ -1466,7 +1466,7 @@ class TestDomainRequestAdmin(MockEppLib):
             # Grab the current dropdown. We do an API call to autocomplete to get this info.
             domain_request_queryset = self.admin.formfield_for_foreignkey(investigator_field, request).queryset
             user_request = self.factory.post(
-                "/admin/autocomplete/?app_label=registrar&model_name=DomainRequest&field_name=investigator"
+                "/admin/autocomplete/?app_label=registrar&model_name=domain_request&field_name=investigator"
             )
             user_admin = MyUserAdmin(User, self.site)
             user_queryset = user_admin.get_search_results(user_request, domain_request_queryset, None)[0]