diff --git a/src/subsys/api/ngx_subsys_lua_api.h.tt2 b/src/subsys/api/ngx_subsys_lua_api.h.tt2
index d31c5e7..0fb7ff3 100644
--- a/src/subsys/api/ngx_subsys_lua_api.h.tt2
+++ b/src/subsys/api/ngx_subsys_lua_api.h.tt2
@@ -39,6 +39,15 @@ typedef struct {
 } ngx_[% subsys %]_lua_value_t;
 
 
+#ifndef NGX_LUA_NO_FFI_API
+typedef struct {
+    int          len;
+    /* this padding hole on 64-bit systems is expected */
+    u_char      *data;
+} ngx_[% subsys %]_lua_ffi_str_t;
+#endif /* NGX_LUA_NO_FFI_API */
+
+
 lua_State *ngx_[% subsys %]_lua_get_global_state(ngx_conf_t *cf);
 
 [% req_type %] *ngx_[% subsys %]_lua_get_request(lua_State *L);
diff --git a/src/subsys/ngx_subsys_lua_util.h.tt2 b/src/subsys/ngx_subsys_lua_util.h.tt2
index 56493c5..039ee48 100644
--- a/src/subsys/ngx_subsys_lua_util.h.tt2
+++ b/src/subsys/ngx_subsys_lua_util.h.tt2
@@ -10,6 +10,7 @@
 
 
 #include "ngx_[% subsys %]_lua_common.h"
+#include "api/ngx_[% subsys %]_lua_api.h"
 
 
 #ifndef NGX_UNESCAPE_URI_COMPONENT
@@ -18,13 +19,6 @@
 
 
 #ifndef NGX_LUA_NO_FFI_API
-typedef struct {
-    int          len;
-    /* this padding hole on 64-bit systems is expected */
-    u_char      *data;
-} ngx_[% subsys %]_lua_ffi_str_t;
-
-
 typedef struct {
     ngx_[% subsys %]_lua_ffi_str_t   key;
     ngx_[% subsys %]_lua_ffi_str_t   value;