diff --git a/epdb/models.py b/epdb/models.py
index 0575e1b9..f94d89e9 100644
--- a/epdb/models.py
+++ b/epdb/models.py
@@ -2373,7 +2373,7 @@ class Edge(EnviPathModel, AliasMixin, ScenarioMixin, AdditionalInformationMixin)
         "epdb.Pathway", verbose_name="belongs to", on_delete=models.CASCADE, db_index=True
     )
     edge_label = models.ForeignKey(
-        "epdb.Reaction", verbose_name="Edge label", null=True, on_delete=models.SET_NULL
+        "epdb.Reaction", verbose_name="Edge label", null=True, on_delete=models.CASCADE
     )
     start_nodes = models.ManyToManyField(
         "epdb.Node", verbose_name="Start Nodes", related_name="edge_educts"