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