diff --git a/modules/structs/user.go b/modules/structs/user.go
index 21ecc1479e..ca6ab79944 100644
--- a/modules/structs/user.go
+++ b/modules/structs/user.go
@@ -20,6 +20,8 @@ type User struct {
 	// the user's authentication sign-in name.
 	// default: empty
 	LoginName string `json:"login_name"`
+	// The ID of the user's Authentication Source
+	SourceID int64 `json:"source_id"`
 	// the user's full name
 	FullName string `json:"full_name"`
 	// swagger:strfmt email
diff --git a/services/convert/user.go b/services/convert/user.go
index 3521dd2f90..1a2733d91e 100644
--- a/services/convert/user.go
+++ b/services/convert/user.go
@@ -75,6 +75,7 @@ func toUser(ctx context.Context, user *user_model.User, signed, authed bool) *ap
 	if authed {
 		result.IsAdmin = user.IsAdmin
 		result.LoginName = user.LoginName
+		result.SourceID = user.LoginSource
 		result.LastLogin = user.LastLoginUnix.AsTime()
 		result.Language = user.Language
 		result.IsActive = user.IsActive
diff --git a/templates/swagger/v1_json.tmpl b/templates/swagger/v1_json.tmpl
index 254b7daf17..532b8880bc 100644
--- a/templates/swagger/v1_json.tmpl
+++ b/templates/swagger/v1_json.tmpl
@@ -24260,6 +24260,12 @@
           "type": "boolean",
           "x-go-name": "Restricted"
         },
+        "source_id": {
+          "description": "The ID of the user's Authentication Source",
+          "type": "integer",
+          "format": "int64",
+          "x-go-name": "SourceID"
+        },
         "starred_repos_count": {
           "type": "integer",
           "format": "int64",