diff --git a/libraries/AP_BoardConfig/board_drivers.cpp b/libraries/AP_BoardConfig/board_drivers.cpp
index cc90d3456e..40b2a30647 100644
--- a/libraries/AP_BoardConfig/board_drivers.cpp
+++ b/libraries/AP_BoardConfig/board_drivers.cpp
@@ -269,10 +269,12 @@ bool AP_BoardConfig::check_ms5611(const char* devname) {
 #define INV2_WHOAMI_ICM20649 0xE1
 
 #define INV3REG_WHOAMI        0x75
+#define INV3REG_456_WHOAMI        0x72
 
 #define INV3_WHOAMI_ICM42688  0x47
 #define INV3_WHOAMI_ICM42670  0x67
 
+#define INV3_WHOAMI_ICM45686  0xE9
 /*
   validation of the board type
  */