diff --git a/arkindex/documents/api/elements.py b/arkindex/documents/api/elements.py
index a875a0383e9a5d7b3c900b01d0f0d2f60e009f2d..3dba171fdc9ff97a8171aaae92540af183a6e76f 100644
--- a/arkindex/documents/api/elements.py
+++ b/arkindex/documents/api/elements.py
@@ -147,7 +147,7 @@ class ElementsList(CorpusACLMixin, ListAPIView):
         if structure_param is not None:
             filters['metadatas__in'] = MetaData.objects.filter(
                 type=MetaType.Structure,
-                value__contains=structure_param
+                value__icontains=structure_param
             )
 
         if 'corpus' in self.request.query_params:
@@ -419,7 +419,7 @@ class ElementParents(ListAPIView):
         if structure_param is not None:
             filters['metadatas__in'] = MetaData.objects.filter(
                 type=MetaType.Structure,
-                value__contains=structure_param
+                value__icontains=structure_param
             )
 
         recursive_param = self.request.query_params.get('recursive')
@@ -569,7 +569,7 @@ class ElementChildren(ListAPIView):
         if structure_param is not None:
             filters['metadatas__in'] = MetaData.objects.filter(
                 type=MetaType.Structure,
-                value__contains=structure_param
+                value__icontains=structure_param
             )
 
         recursive_param = self.request.query_params.get('recursive')