diff --git a/mm2src/docker_tests.rs b/mm2src/docker_tests.rs
index 66003c74a3..c1bc429e1b 100644
--- a/mm2src/docker_tests.rs
+++ b/mm2src/docker_tests.rs
@@ -2234,12 +2234,13 @@ mod docker_tests {
         })))
         .unwrap();
         assert!(rc.0.is_success(), "!max_taker_vol: {}", rc.1);
-        let json: Json = json::from_str(&rc.1).unwrap();
+        let json: MaxTakerVolResponse = json::from_str(&rc.1).unwrap();
         // the result of equation `max_vol + max_vol / 777 + 0.00002 = 1`
         // derived from `max_vol = balance - locked - trade_fee - fee_to_send_taker_fee - dex_fee(max_vol)`
         // where balance = 1, locked = 0, trade_fee = fee_to_send_taker_fee = 0.00001, dex_fee = max_vol / 777
-        assert_eq!(json["result"]["numer"], Json::from("38849223"));
-        assert_eq!(json["result"]["denom"], Json::from("38900000"));
+        let expected = MmNumber::from((38849223, 38900000)).to_fraction();
+        assert_eq!(json.result, expected);
+        assert_eq!(json.coin, "MYCOIN1");
 
         let rc = block_on(mm_alice.rpc(json! ({
             "userpass": mm_alice.userpass,
@@ -2247,10 +2248,7 @@ mod docker_tests {
             "base": "MYCOIN1",
             "rel": "MYCOIN",
             "price": 1,
-            "volume": {
-                "numer": json["result"]["numer"],
-                "denom": json["result"]["denom"],
-            }
+            "volume": json.result,
         })))
         .unwrap();
         assert!(rc.0.is_success(), "!sell: {}", rc.1);
diff --git a/mm2src/lp_swap/taker_swap.rs b/mm2src/lp_swap/taker_swap.rs
index 5663d4304b..83748c3bf9 100644
--- a/mm2src/lp_swap/taker_swap.rs
+++ b/mm2src/lp_swap/taker_swap.rs
@@ -1713,7 +1713,8 @@ pub async fn max_taker_vol(ctx: MmArc, req: Json) -> Result<Response<Vec<u8>>, S
     };
 
     let res = try_s!(json::to_vec(&json!({
-        "result": max_vol.to_fraction()
+        "result": max_vol.to_fraction(),
+        "coin": coin.ticker(),
     })));
     Ok(try_s!(Response::builder().body(res)))
 }
diff --git a/mm2src/mm2_tests/structs.rs b/mm2src/mm2_tests/structs.rs
index 0b3affb8c4..d9ed6fc74a 100644
--- a/mm2src/mm2_tests/structs.rs
+++ b/mm2src/mm2_tests/structs.rs
@@ -500,6 +500,7 @@ impl TradePreimageResponse {
 #[serde(deny_unknown_fields)]
 pub struct MaxTakerVolResponse {
     pub result: Fraction,
+    pub coin: String,
 }
 
 #[derive(Debug, Deserialize)]