diff --git a/internal/mempool/mempool_test.go b/internal/mempool/mempool_test.go
index 03bb3f7b4..b440503d3 100644
--- a/internal/mempool/mempool_test.go
+++ b/internal/mempool/mempool_test.go
@@ -3,6 +3,7 @@ package mempool
 import (
 	"bytes"
 	"context"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"math/rand"
@@ -945,17 +946,24 @@ func TestAppendCheckTxErr(t *testing.T) {
 	}
 	t.Cleanup(client.Wait)
 	txmp := setup(t, client, 500)
-	existingLogData := `[{"log":"existing error log"}]`
-	newLogData := "sample error log"
+	existingData := `[{"log":"existing error log"}]`
 
 	// Append new error
-	actualResult := txmp.AppendCheckTxErr(existingLogData, newLogData)
-	expectedResult := fmt.Sprintf(`[{"log":"existing error log"},{"log":"%s"}]`, newLogData)
+	result := txmp.AppendCheckTxErr(existingData, "sample error msg")
 
-	require.Equal(t, expectedResult, actualResult)
+	// Unmarshal the result
+	var data []map[string]interface{}
+	err := json.Unmarshal([]byte(result), &data)
+	require.NoError(t, err)
+	require.Equal(t, len(data), 2)
+	require.Equal(t, data[1]["log"], "sample error msg")
 
 	// Append new error to empty log
-	actualResult = txmp.AppendCheckTxErr("", newLogData)
+	result = txmp.AppendCheckTxErr("", "sample error msg")
 
-	require.Equal(t, `[{"log":"sample error log"}]`, actualResult)
+	// Unmarshal the result
+	err = json.Unmarshal([]byte(result), &data)
+	require.NoError(t, err)
+	require.Equal(t, len(data), 1)
+	require.Equal(t, data[0]["log"], "sample error msg")
 }