diff --git a/templates/blocks.tmpl b/templates/blocks.tmpl
index 5a5c0aa..f636957 100644
--- a/templates/blocks.tmpl
+++ b/templates/blocks.tmpl
@@ -35,12 +35,14 @@ typedef union {
 typdef struct {
     uint8_t version;
     MessageID {{.CenumPCTOESP.EnumName}};
+    uint8_t length;
     PayloadUnion payload;
 } PCTOESPBaseMessage;
 
 typdef struct {
     uint8_t version;
     MessageID {{.CenumESPTOPC.EnumName}};
+    uint8_t length;
     PayloadUnion payload;
 } ESPTOPCBaseMessage;
 {{end}}