diff --git a/url_filter/backends/django.py b/url_filter/backends/django.py
index 48aa2c3..5f5cedf 100644
--- a/url_filter/backends/django.py
+++ b/url_filter/backends/django.py
@@ -107,7 +107,8 @@ def filter_by_specs(self, queryset):
             queryset = queryset.exclude(**{lookup: value})
 
         to_many = self._is_any_to_many()
-        return queryset.distinct() if to_many and (include or exclude) else queryset
+        is_distinct = bool(queryset.query.distinct_fields)
+        return queryset.distinct() if (not is_distinct) and to_many and (include or exclude) else queryset
 
     def _is_any_to_many(self):
         return any(
diff --git a/url_filter/validators.py b/url_filter/validators.py
index d40d0ca..fa6c5d8 100644
--- a/url_filter/validators.py
+++ b/url_filter/validators.py
@@ -6,7 +6,7 @@
     MinLengthValidator as _MinLengthValidator,
 )
 from django.utils.deconstruct import deconstructible
-from django.utils.translation import ungettext_lazy
+from django.utils.translation import ngettext_lazy
 
 
 @deconstructible
@@ -16,7 +16,7 @@ class MinLengthValidator(_MinLengthValidator):
     """
 
     code = "min_length"
-    message = ungettext_lazy(
+    message = ngettext_lazy(
         "Ensure this value has at least %(limit_value)d items (it has %(show_value)d).",
         "Ensure this value has at least %(limit_value)d items (it has %(show_value)d).",
         "limit_value",
@@ -36,7 +36,7 @@ class MaxLengthValidator(_MaxLengthValidator):
     """
 
     code = "max_length"
-    message = ungettext_lazy(
+    message = ngettext_lazy(
         "Ensure this value has at most %(limit_value)d items (it has %(show_value)d).",
         "Ensure this value has at most %(limit_value)d items (it has %(show_value)d).",
         "limit_value",