diff --git a/mpp/hal/vpu/h264e/hal_h264e_vepu1_v2.c b/mpp/hal/vpu/h264e/hal_h264e_vepu1_v2.c
index fad298da..e0b846fe 100644
--- a/mpp/hal/vpu/h264e/hal_h264e_vepu1_v2.c
+++ b/mpp/hal/vpu/h264e/hal_h264e_vepu1_v2.c
@@ -177,7 +177,10 @@ static RK_U32 update_vepu1_syntax(HalH264eVepu1Ctx *ctx, MppSyntax *syntax)
         case H264E_SYN_RC : {
             hal_h264e_dbg_detail("update rc");
         } break;
-        case H264E_SYN_PREFIX :
+        case H264E_SYN_PREFIX : {
+            hal_h264e_dbg_detail("update prefix nal");
+            ctx->prefix = desc->p;
+        } break;
         default : {
             mpp_log_f("invalid syntax type %d\n", desc->type);
         } break;