diff --git a/taiga/projects/references/api.py b/taiga/projects/references/api.py
index 42d7f5a6..ff114ac6 100644
--- a/taiga/projects/references/api.py
+++ b/taiga/projects/references/api.py
@@ -24,7 +24,7 @@ from taiga.base.api import viewsets
 from taiga.base.api.utils import get_object_or_404
 from taiga.permissions.services import user_has_perm
 
-from .serializers import ResolverSerializer
+from .validators import ResolverValidator
 from . import permissions
 
 
@@ -32,11 +32,11 @@ class ResolverViewSet(viewsets.ViewSet):
     permission_classes = (permissions.ResolverPermission,)
 
     def list(self, request, **kwargs):
-        serializer = ResolverSerializer(data=request.QUERY_PARAMS)
-        if not serializer.is_valid():
-            raise exc.BadRequest(serializer.errors)
+        validator = ResolverValidator(data=request.QUERY_PARAMS)
+        if not validator.is_valid():
+            raise exc.BadRequest(validator.errors)
 
-        data = serializer.data
+        data = validator.data
 
         project_model = apps.get_model("projects", "Project")
         project = get_object_or_404(project_model, slug=data["project"])
diff --git a/taiga/projects/references/serializers.py b/taiga/projects/references/validators.py
similarity index 95%
rename from taiga/projects/references/serializers.py
rename to taiga/projects/references/validators.py
index fb9ad177..5fcefee8 100644
--- a/taiga/projects/references/serializers.py
+++ b/taiga/projects/references/validators.py
@@ -17,9 +17,10 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from taiga.base.api import serializers
+from taiga.base.api import validators
 
 
-class ResolverSerializer(serializers.Serializer):
+class ResolverValidator(validators.Validator):
     project = serializers.CharField(max_length=512, required=True)
     milestone = serializers.CharField(max_length=512, required=False)
     us = serializers.IntegerField(required=False)