diff --git a/include/pointpillar.h b/include/pointpillar.h
index 3537154..9a19146 100644
--- a/include/pointpillar.h
+++ b/include/pointpillar.h
@@ -14,6 +14,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+#ifndef _POINTPILLAR_H_
+#define _POINTPILLAR_H_
 #include <memory>
 
 #include "cuda_runtime.h"
@@ -102,4 +104,4 @@ class PointPillar {
     ~PointPillar(void);
     int doinfer(void*points, unsigned int point_size, std::vector<Bndbox> &res);
 };
-
+#endif // _POINTPILLAR_H_