diff --git a/server/auth_audit_test.go b/server/auth_audit_test.go
index 4ad4bb0..bcee600 100644
--- a/server/auth_audit_test.go
+++ b/server/auth_audit_test.go
@@ -110,6 +110,7 @@ func TestUserQuerySupportsKeywordAndUserIDs(t *testing.T) {
 		t.Fatalf("unexpected filter arguments: got %#v, want %#v", args, want)
 	}
 	for _, field := range []string{
+		"CAST(u.id AS CHAR) AS user_id",
 		"AS avatar",
 		"u.account_no AS display_no",
 		"AS register_type",
diff --git a/server/internal_admin_query_resources.go b/server/internal_admin_query_resources.go
index 18ad9bd..1cb9070 100644
--- a/server/internal_admin_query_resources.go
+++ b/server/internal_admin_query_resources.go
@@ -265,7 +265,7 @@ func internalAdminQuerySpec(resource string) (*internalQuerySpec, bool) {
 
 func usersInternalQuerySpec() *internalQuerySpec {
 	return &internalQuerySpec{
-		Select: `SELECT u.id AS user_id,u.account_no AS display_no,u.username,u.phone,u.state,u.stateat AS state_at,u.access,u.lastseen AS last_seen,u.useragent AS user_agent,u.public,u.trusted,
+		Select: `SELECT CAST(u.id AS CHAR) AS user_id,u.account_no AS display_no,u.username,u.phone,u.state,u.stateat AS state_at,u.access,u.lastseen AS last_seen,u.useragent AS user_agent,u.public,u.trusted,
 			p.nickname,p.public_account,p.gender,p.region,p.avatar_file_id,
 			COALESCE(
 				NULLIF(avatar.location,''),