diff --git a/template/hal_rec_wrapper.c b/template/hal_rec_wrapper.c
index c35c935..44a1448 100644
--- a/template/hal_rec_wrapper.c
+++ b/template/hal_rec_wrapper.c
@@ -13,7 +13,9 @@
 
 
 /* %%%-SFUNWIZ_wrapper_includes_Changes_BEGIN --- EDIT HERE TO _END */
- 
+#ifdef HAL_IMPL
+#include "param_pre.h"
+#endif
 /* %%%-SFUNWIZ_wrapper_includes_Changes_END --- EDIT HERE TO _BEGIN */
 #define u_width 1
 
@@ -42,7 +44,7 @@ static void pack(uint8_T *pkg, uint16_T *len, const int_T y_width, uint8_T *ts,
         sum += src[i];
     }
     pkg[j] = sum;
-    len[0] = length+5;
+    len[0] = length+4;
 }
 
 /* %%%-SFUNWIZ_wrapper_externs_Changes_END --- EDIT HERE TO _BEGIN */