diff --git a/interfaces/kits/c/net_ssl/include/net_ssl_c_type.h b/interfaces/kits/c/net_ssl/include/net_ssl_c_type.h
index 754cdc44..9e480c14 100644
--- a/interfaces/kits/c/net_ssl/include/net_ssl_c_type.h
+++ b/interfaces/kits/c/net_ssl/include/net_ssl_c_type.h
@@ -37,6 +37,7 @@
  */
 
 #include <stdint.h>
+#include <cstddef>
 
 #ifdef __cplusplus
 extern "C" {