diff --git a/plat/arm/board/fvp/fvp_cpu_errata.mk b/plat/arm/board/fvp/fvp_cpu_errata.mk
index 342bc9f..b26fa80 100644
--- a/plat/arm/board/fvp/fvp_cpu_errata.mk
+++ b/plat/arm/board/fvp/fvp_cpu_errata.mk
@@ -16,6 +16,7 @@
 CORTEX_A78_AE_H_INC	:= 1
 CORTEX_A78C_H_INC	:= 1
 CORTEX_X3_H_INC		:= 1
+CORTEX_X4_H_INC		:= 1
 NEOVERSE_N2_H_INC	:= 1
 NEOVERSE_V1_H_INC	:= 1
 $(eval $(call add_define, CORTEX_A710_H_INC))
@@ -23,6 +24,7 @@
 $(eval $(call add_define, CORTEX_A78_AE_H_INC))
 $(eval $(call add_define, CORTEX_A78C_H_INC))
 $(eval $(call add_define, CORTEX_X3_H_INC))
+$(eval $(call add_define, CORTEX_X4_H_INC))
 $(eval $(call add_define, NEOVERSE_N2_H_INC))
 $(eval $(call add_define, NEOVERSE_V1_H_INC))
 endif
diff --git a/plat/arm/board/fvp/platform.mk b/plat/arm/board/fvp/platform.mk
index 35086e4..5e9b1d7 100644
--- a/plat/arm/board/fvp/platform.mk
+++ b/plat/arm/board/fvp/platform.mk
@@ -210,6 +210,7 @@
 					lib/cpus/aarch64/neoverse_v1.S		\
 					lib/cpus/aarch64/neoverse_e1.S		\
 					lib/cpus/aarch64/cortex_x2.S		\
+					lib/cpus/aarch64/cortex_x4.S		\
 					lib/cpus/aarch64/cortex_gelas.S		\
 					lib/cpus/aarch64/nevis.S		\
 					lib/cpus/aarch64/travis.S