diff --git a/internal/model/node/model.go b/internal/model/node/model.go
index eb250bb..e6961c1 100644
--- a/internal/model/node/model.go
+++ b/internal/model/node/model.go
@@ -103,7 +103,7 @@ func (m *customServerModel) FilterNodeList(ctx context.Context, params *FilterNo
 		// Multiple group IDs: node must belong to at least one of the groups
 		var conditions []string
 		for _, gid := range params.NodeGroupIds {
-			conditions = append(conditions, fmt.Sprintf("JSON_CONTAINS(node_group_ids, %d)", gid))
+			conditions = append(conditions, fmt.Sprintf("JSON_CONTAINS(node_group_ids, '%d')", gid))
 		}
 		if len(conditions) > 0 {
 			query = query.Where("(" + strings.Join(conditions, " OR ") + ")")