diff --git a/schemas/solver-input.json b/schemas/solver-input.json
index c19ec06e95b387413d525d8b533a397a89ab84a9..f3b063738630a9e3704d0465b4a80139bd1691a4 100644
--- a/schemas/solver-input.json
+++ b/schemas/solver-input.json
@@ -6,7 +6,7 @@
       "aks": {"type": "array", "items": {"$ref": "/schema/ak.schema.json"}},
       "rooms": {"type": "array", "items": {"$ref": "/schema/room.schema.json"}},
       "participants": {"type": "array", "items": {"$ref": "/schema/participant.schema.json"}},
-      "timeslots": {"type": "array", "items": {"$ref": "/schema/timeslot.schema.json"}},
+      "timeslots": {"$ref": "/schema/timeslot.schema.json"},
       "info": {
         "type": "object",
         "properties": {