diff --git a/structs.go b/structs.go
index 3657f13..475107c 100644
--- a/structs.go
+++ b/structs.go
@@ -2212,7 +2212,7 @@ func (activity *Activity) UnmarshalJSON(b []byte) error {
 		Type          ActivityType `json:"type"`
 		URL           string       `json:"url,omitempty"`
 		CreatedAt     int64        `json:"created_at"`
-		ApplicationID string       `json:"application_id,omitempty"`
+		ApplicationID json.Number  `json:"application_id,omitempty"`
 		State         string       `json:"state,omitempty"`
 		Details       string       `json:"details,omitempty"`
 		Timestamps    TimeStamps   `json:"timestamps,omitempty"`
@@ -2227,8 +2227,8 @@ func (activity *Activity) UnmarshalJSON(b []byte) error {
 	if err != nil {
 		return err
 	}
+	activity.ApplicationID = temp.ApplicationID.String()
 	activity.CreatedAt = time.Unix(0, temp.CreatedAt*1000000)
-	activity.ApplicationID = temp.ApplicationID
 	activity.Assets = temp.Assets
 	activity.Details = temp.Details
 	activity.Emoji = temp.Emoji