diff --git a/include/lib/aarch64/arch.h b/include/lib/aarch64/arch.h
index ff3881e..a446941 100644
--- a/include/lib/aarch64/arch.h
+++ b/include/lib/aarch64/arch.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -528,6 +528,12 @@
 #define EC_AARCH64_FP			U(0x2c)
 #define EC_SERROR			U(0x2f)
 
+/*
+ * External Abort bit in Instruction and Data Aborts synchronous exception
+ * syndromes.
+ */
+#define ESR_ISS_EABORT_EA_BIT		U(9)
+
 #define EC_BITS(x)			(((x) >> ESR_EC_SHIFT) & ESR_EC_MASK)
 
 /* Reset bit inside the Reset management register for EL3 (RMR_EL3) */