diff --git a/ipmbdefines.hpp b/ipmbdefines.hpp
index 3797e92..ed7adb3 100644
--- a/ipmbdefines.hpp
+++ b/ipmbdefines.hpp
@@ -61,4 +61,10 @@
 } IPMB_HEADER;
 #pragma pack()
 
+typedef struct _IPMB_DRV_HDR
+{
+    uint8_t len;
+    IPMB_HEADER hdr;
+} IPMB_PKT;
+
 #endif