diff --git a/.changeset/nine-planets-burn.md b/.changeset/nine-planets-burn.md
new file mode 100644
index 000000000000..bc6640f31830
--- /dev/null
+++ b/.changeset/nine-planets-burn.md
@@ -0,0 +1,5 @@
+---
+"@ledgerhq/live-common": patch
+---
+
+fix: hex signature
diff --git a/libs/ledger-live-common/src/exchange/platform/transfer/completeExchange.ts b/libs/ledger-live-common/src/exchange/platform/transfer/completeExchange.ts
index 71c131d3a233..e78e26089a86 100644
--- a/libs/ledger-live-common/src/exchange/platform/transfer/completeExchange.ts
+++ b/libs/ledger-live-common/src/exchange/platform/transfer/completeExchange.ts
@@ -182,9 +182,11 @@ const completeExchange = (
  * @return {Buffer} The correct format Buffer for AppExchange call.
  */
 function convertSignature(signature: string, exchangeType: ExchangeTypes): Buffer {
-  return isExchangeTypeNg(exchangeType)
-    ? Buffer.from(signature, "base64url")
-    : <Buffer>secp256k1.signatureExport(Buffer.from(signature, "hex"));
+  if (isExchangeTypeNg(exchangeType)) {
+    return Buffer.from(signature, "base64url");
+  }
+  if (exchangeType === ExchangeTypes.Sell) return Buffer.from(signature, "hex");
+  return <Buffer>secp256k1.signatureExport(Buffer.from(signature, "hex"));
 }
 
 export default completeExchange;