diff --git a/api/s34_sa_cal.py b/api/s34_sa_cal.py
index 41fabd4..fd656f6 100644
--- a/api/s34_sa_cal.py
+++ b/api/s34_sa_cal.py
@@ -77,7 +77,7 @@ def _calculate_service_area(name: str, inp, time_index: int = 0) -> dict[str, li
             up_link_nodes = node_upstream[node]
             ready = True
             for link_node in up_link_nodes:
-                if link_node in node_wip:
+                if link_node[1] in node_wip:
                     ready = False
                     break
             if ready: