diff --git a/qt/aqt/mediasrv.py b/qt/aqt/mediasrv.py
index 4c7b7cce0..a728211ef 100644
--- a/qt/aqt/mediasrv.py
+++ b/qt/aqt/mediasrv.py
@@ -413,7 +413,8 @@ def complete_tag() -> bytes:
 
 
 def card_stats() -> bytes:
-    return aqt.mw.col.card_stats_data(CardId(int(request.data)))
+    args = from_json_bytes(request.data)
+    return aqt.mw.col.card_stats_data(CardId(args["cardId"]))
 
 
 # these require a collection
diff --git a/ts/card-info/lib.ts b/ts/card-info/lib.ts
index 09803df2c..4ba34139b 100644
--- a/ts/card-info/lib.ts
+++ b/ts/card-info/lib.ts
@@ -6,6 +6,6 @@ import { postRequest } from "../lib/postrequest";
 
 export async function getCardStats(cardId: number): Promise<Stats.CardStatsResponse> {
     return Stats.CardStatsResponse.decode(
-        await postRequest("/_anki/cardStats", JSON.stringify(cardId))
+        await postRequest("/_anki/cardStats", JSON.stringify({ cardId }))
     );
 }