diff --git a/libraries/AP_InternalError/AP_InternalError.cpp b/libraries/AP_InternalError/AP_InternalError.cpp
index 4823791355..c40d1029c2 100644
--- a/libraries/AP_InternalError/AP_InternalError.cpp
+++ b/libraries/AP_InternalError/AP_InternalError.cpp
@@ -54,6 +54,7 @@ void AP_InternalError::errors_as_string(uint8_t *buffer, const uint16_t len) con
         "sfs_recursion",  // switch_full_sector_recursion
         "bad_rotation",
         "stack_ovrflw",  // stack_overflow
+        "imu_reset",  // imu_reset
     };
 
     static_assert((1U<<(ARRAY_SIZE(error_bit_descriptions))) == uint32_t(AP_InternalError::error_t::__LAST__), "too few descriptions for bits");
diff --git a/libraries/AP_InternalError/AP_InternalError.h b/libraries/AP_InternalError/AP_InternalError.h
index f27f72ad90..bd01cdf35d 100644
--- a/libraries/AP_InternalError/AP_InternalError.h
+++ b/libraries/AP_InternalError/AP_InternalError.h
@@ -61,7 +61,8 @@ public:
         switch_full_sector_recursion= (1U << 21),  //0x200000  2097152
         bad_rotation                = (1U << 22),  //0x400000  4194304
         stack_overflow              = (1U << 23),  //0x800000  8388608
-        __LAST__                    = (1U << 24),  // used only for sanity check
+        imu_reset                   = (1U << 24),  //0x1000000 16777216
+        __LAST__                    = (1U << 25),  // used only for sanity check
     };
 
     // if you've changed __LAST__ to be 32, then you will want to