diff --git a/mmtfPyspark/webfilters/advancedQuery.py b/mmtfPyspark/webfilters/advancedQuery.py
index 2e3cf0f..fd7a738 100644
--- a/mmtfPyspark/webfilters/advancedQuery.py
+++ b/mmtfPyspark/webfilters/advancedQuery.py
@@ -86,8 +86,8 @@ def _get_structure_entity_id(self, structure, origStructureId, origEntityId):
         keyStructureId = origStructureId
 
         try:
-            # index = keyStructureId.index(".")
-            index = keyStructureId.index("_")
+            index = keyStructureId.index(".")
+            #index = keyStructureId.index("_")
             keyStructureId = keyStructureId[:index]
         except:
             pass