diff --git a/src/uk/ac/ebi/vfb/neo4j/KB_tools.py b/src/uk/ac/ebi/vfb/neo4j/KB_tools.py
index 5f4de5a2..eb1f1331 100644
--- a/src/uk/ac/ebi/vfb/neo4j/KB_tools.py
+++ b/src/uk/ac/ebi/vfb/neo4j/KB_tools.py
@@ -1049,9 +1049,9 @@ def add_anatomy_image_set(self,
                          o=anat_id['iri'])
 
         edge_annotations = {}
-        if index: edge_annotations['index'] = index
-        if center: edge_annotations['center'] = center
-        if image_filename: edge_annotations['filename'] = image_filename
+        if index: edge_annotations['index'] = [index]
+        if center: edge_annotations['center'] = [center]
+        if image_filename: edge_annotations['filename'] = [image_filename]
 
         if template == 'self':
             template = channel_id['short_form']