diff --git a/BTCPayServer/wwwroot/swagger/v1/swagger.template.stores-wallet.on-chain.json b/BTCPayServer/wwwroot/swagger/v1/swagger.template.stores-wallet.on-chain.json
index 1b4598286..9a1c5c98f 100644
--- a/BTCPayServer/wwwroot/swagger/v1/swagger.template.stores-wallet.on-chain.json
+++ b/BTCPayServer/wwwroot/swagger/v1/swagger.template.stores-wallet.on-chain.json
@@ -613,7 +613,7 @@
                         }
                     },
                     "feeRate": {
-                        "type": "string",
+                        "type": "number",
                         "format": "decimal or long (sats/byte)",
                         "description": "A wallet address or a BIP21 payment link"
                     },