diff --git a/main.py b/main.py
index 70a089b..ff928b6 100644
--- a/main.py
+++ b/main.py
@@ -1065,7 +1065,7 @@ async def fastapi_get_emitter_properties(network: str, junction: str) -> dict[st
 @app.post("/setemitterproperties/")
 async def fastapi_set_emitter_properties(network: str, junction: str, req: Request) -> ChangeSet:
     props = await req.json()
-    ps = { 'id' : junction } | props
+    ps = { 'junction' : junction } | props
     return set_emitter(network, ChangeSet(ps))