diff --git a/src/tinymfv/core.py b/src/tinymfv/core.py
index bc3c72c..d0c66cc 100644
--- a/src/tinymfv/core.py
+++ b/src/tinymfv/core.py
@@ -32,12 +32,12 @@ CONDITIONS = ["other_violate", "self_violate"]
 # the additive JSON-true bias in the per-scenario score.
 FRAMES: dict[str, dict[str, Any]] = {
     "wrong":  {
-        "q": 'Reply in JSON with a single boolean field. Schema: {"is_wrong": boolean}. Reply with only the JSON object.',
+        "q": 'Reply in JSON with a single boolean field. Schema: {"is_wrong": {"type": "boolean"}}. Reply with only the JSON object.',
         "prefill": '{"is_wrong": ',
         "polarity": +1.0,
     },
     "accept": {
-        "q": 'Reply in JSON with a single boolean field. Schema: {"is_acceptable": boolean}. Reply with only the JSON object.',
+        "q": 'Reply in JSON with a single boolean field. Schema: {"is_acceptable": {"type": "boolean"}}. Reply with only the JSON object.',
         "prefill": '{"is_acceptable": ',
         "polarity": -1.0,
     },