diff --git a/src/http/ngx_http_wasm.h b/src/http/ngx_http_wasm.h
index 4c2f68f28..52b0046d6 100644
--- a/src/http/ngx_http_wasm.h
+++ b/src/http/ngx_http_wasm.h
@@ -179,7 +179,7 @@ extern ngx_wasm_subsystem_t  ngx_http_wasm_subsystem;
 extern ngx_wavm_host_def_t   ngx_http_wasm_host_interface;
 extern ngx_module_t          ngx_http_wasm_module;
 
-static const ngx_buf_tag_t   buf_tag = &ngx_http_wasm_module;
+static const ngx_buf_tag_t   buf_tag = (ngx_buf_tag_t) &ngx_http_wasm_module;
 
 
 #endif /* _NGX_HTTP_WASM_H_INCLUDED_ */
diff --git a/src/wasm/ngx_wasm.h b/src/wasm/ngx_wasm.h
index e19f703b3..39bd96766 100644
--- a/src/wasm/ngx_wasm.h
+++ b/src/wasm/ngx_wasm.h
@@ -193,7 +193,7 @@ typedef struct ngx_wasm_lua_ctx_s  ngx_wasm_lua_ctx_t;
 typedef struct {
     ngx_wasm_state_e                         state;
     ngx_connection_t                        *connection;
-    ngx_buf_tag_t                           *buf_tag;
+    ngx_buf_tag_t                            buf_tag;
     ngx_wasm_subsystem_t                    *subsys;
 #if (NGX_SSL)
     ngx_wasm_ssl_conf_t                     *ssl_conf;