diff --git a/pypath/resources/data_formats.py b/pypath/resources/data_formats.py
index a98dd485a..c7c3d14d4 100644
--- a/pypath/resources/data_formats.py
+++ b/pypath/resources/data_formats.py
@@ -2945,6 +2945,7 @@ def _pathwaycommons_single_resource(resource, transcription = False):
         header = False,
         extra_edge_attrs = {
             'type': 4,
+            'is_ppi': 7,
         },
         extra_node_attrs_a = {
             'cellphonedb_type': 5,