diff --git a/reframe/schemas/config.json b/reframe/schemas/config.json
index 59a1d8f9ec..c699062426 100644
--- a/reframe/schemas/config.json
+++ b/reframe/schemas/config.json
@@ -116,8 +116,7 @@
                     "items": {"type": "string"}
                 },
                 "use_nodes_option": {"type": "boolean"}
-            },
-            "additionalProperties": false
+            }
         },
         "stream_handler": {
             "allOf": [
@@ -275,11 +274,7 @@
                                 "name": {"$ref": "#/defs/alphanum_ext_string"},
                                 "descr": {"type": "string"},
                                 "scheduler": {
-                                    "type": "string",
-                                    "enum": [
-                                        "flux", "local", "lsf", "oar", "pbs",
-                                        "sge", "slurm", "squeue", "torque"
-                                    ]
+                                    "type": "string"
                                 },
                                 "sched_options": {"$ref": "#/defs/sched_options"},
                                 "launcher": {