diff --git a/include/mbedtls/platform.h b/include/mbedtls/platform.h
index 89fe8a7..82d5e33 100644
--- a/include/mbedtls/platform.h
+++ b/include/mbedtls/platform.h
@@ -45,6 +45,7 @@
 
 #define MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED     -0x0070 /**< Hardware accelerator failed */
 #define MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED -0x0072 /**< The requested feature is not supported by the platform */
+#define MBEDTLS_ERR_PLATFORM_FAULT_DETECTED      -0x0071 /**< A fault was detected in a critical path, likely indicative of an active physical attack */
 
 #ifdef __cplusplus
 extern "C" {