diff --git a/modules/lua/lua_request.c b/modules/lua/lua_request.c
index a840c1e80f..e97c7fb278 100644
--- a/modules/lua/lua_request.c
+++ b/modules/lua/lua_request.c
@@ -28,6 +28,8 @@
 #include "apr_thread_mutex.h"
 #include "apr_tables.h"
 #include "util_cookies.h"
+
+#define APR_WANT_BYTEFUNC
 #include "apr_want.h"
 
 extern apr_global_mutex_t* lua_ivm_mutex;