diff --git a/backend/src/app.py b/backend/src/app.py
index f48ef1a..9835362 100644
--- a/backend/src/app.py
+++ b/backend/src/app.py
@@ -85,7 +85,13 @@ def join():
     if room.pin is not None and room.pin != code:
         return error("Invalid code")
 
-    distance = distance_between_coords(room.coord, Coordinates(latitude=int(request.args["lat"]), longitude=int(request.args["lot"])))
+    distance = distance_between_coords(
+        lhs=room.coord,
+        rhs=Coordinates(
+            latitude=int(request.args["lat"]),
+            longitude=int(request.args["lon"]),
+        ),
+    )
 
     if distance > room.range_size:
         return error("You are not within the room range")