diff --git a/thermostat.py b/thermostat.py
index df59429..39a1649 100644
--- a/thermostat.py
+++ b/thermostat.py
@@ -204,7 +204,7 @@ cursor.execute("CREATE TABLE IF NOT EXISTS set_mode (name TEXT PRIMARY KEY DEFAU
 
 Set_mode_parser = api.parser()
 Set_mode_parser.add_argument(
-  "value", type=str, choices=targets+modes, required=True, help="value", location="form"
+  "value", type=str, choices=targets+modes, required=True, help="value", location="json"
 )
 
 @ns_thermostat.route('/set_mode')