diff --git a/pkg/query-service/app/clickhouseReader/reader.go b/pkg/query-service/app/clickhouseReader/reader.go
index 197997409f..39f9c38992 100644
--- a/pkg/query-service/app/clickhouseReader/reader.go
+++ b/pkg/query-service/app/clickhouseReader/reader.go
@@ -1854,6 +1854,7 @@ func (r *ClickHouseReader) GetTopOperations(ctx context.Context, queryParams *mo
 			quantile(0.95)(durationNano) as p95,
 			quantile(0.99)(durationNano) as p99,
 			COUNT(*) as numCalls,
+			countIf(statusCode=2) as errorCount,
 			name
 		FROM %s.%s
 		WHERE serviceName = @serviceName AND timestamp>= @start AND timestamp<= @end`,
diff --git a/pkg/query-service/model/response.go b/pkg/query-service/model/response.go
index d6a0570234..31d5a05ae6 100644
--- a/pkg/query-service/model/response.go
+++ b/pkg/query-service/model/response.go
@@ -272,6 +272,7 @@ type TopOperationsItem struct {
 	Percentile95 float64 `json:"p95" ch:"p95"`
 	Percentile99 float64 `json:"p99" ch:"p99"`
 	NumCalls     uint64  `json:"numCalls" ch:"numCalls"`
+	ErrorCount   uint64  `json:"errorCount" ch:"errorCount"`
 	Name         string  `json:"name" ch:"name"`
 }