diff --git a/api/desc/core/pcm-core.api b/api/desc/core/pcm-core.api
index 06909457..6070d68b 100644
--- a/api/desc/core/pcm-core.api
+++ b/api/desc/core/pcm-core.api
@@ -199,7 +199,7 @@ type (
         TaskId int64 `json:"taskId,optional"`
         TaskType string `json:"taskType,optional"`
         matchLabels map[string]string `json:"matchLabels"`
-        participantId string `json:"participantId"`
+        participantId int64 `json:"participantId"`
         metadata interface{} `json:"metadata"`
     }
 )
diff --git a/api/internal/types/types.go b/api/internal/types/types.go
index a27aaca6..57c35616 100644
--- a/api/internal/types/types.go
+++ b/api/internal/types/types.go
@@ -179,7 +179,7 @@ type TaskInfo struct {
 	TaskId        int64             `json:"taskId,optional"`
 	TaskType      string            `json:"taskType,optional"`
 	MatchLabels   map[string]string `json:"matchLabels"`
-	ParticipantId string            `json:"participantId"`
+	ParticipantId int64             `json:"participantId"`
 	Metadata      interface{}       `json:"metadata"`
 }