diff --git a/plat/arm/board/fvp/platform.mk b/plat/arm/board/fvp/platform.mk
index 4164242..07c4842 100644
--- a/plat/arm/board/fvp/platform.mk
+++ b/plat/arm/board/fvp/platform.mk
@@ -180,7 +180,8 @@
 ENABLE_AMU			:=	1
 
 ifeq (${ENABLE_AMU},1)
-BL31_SOURCES		+= lib/cpus/aarch64/cortex_a75_pubsub.c
+BL31_SOURCES		+=	lib/cpus/aarch64/cortex_a75_pubsub.c			\
+				lib/cpus/aarch64/cpuamu_helpers.S
 endif
 
 ifneq (${ENABLE_STACK_PROTECTOR},0)