diff --git a/src/paveit/datamodels/norm_specification.py b/src/paveit/datamodels/norm_specification.py
index f464ea0..0dea4bf 100644
--- a/src/paveit/datamodels/norm_specification.py
+++ b/src/paveit/datamodels/norm_specification.py
@@ -1,6 +1,6 @@
 from mongoengine import *
 
-from .enumeration import RelationalOperatorsEnum, BitumenCategoryEnum, NormEnum
+from .enumeration import RelationalOperatorsEnum, BitumenCategoryEnum
 from .norm_documents import NormDocumentAggregate, NormDocumentBitumen, NormDocumentAsphalt
 class EnumerateBase(Document):