diff --git a/hub-config/tasks.json b/hub-config/tasks.json
index 174fdf3..a87b282 100644
--- a/hub-config/tasks.json
+++ b/hub-config/tasks.json
@@ -40,7 +40,7 @@
                         "sample": {
                             "output_type_id_params": {
                                 "is_required": true,
-                                "type": "string",
+                                "type": "character",
                                 "min_samples_per_task": 1,
                                 "max_samples_per_task": 100,
                                 "compound_taskid_set": ["round_id", "scenario_id", "target", "location", "pop_group"]