diff --git a/plat/arm/css/common/css_common.mk b/plat/arm/css/common/css_common.mk
index c41a1fb..1e4851c 100644
--- a/plat/arm/css/common/css_common.mk
+++ b/plat/arm/css/common/css_common.mk
@@ -35,6 +35,7 @@
 				drivers/arm/css/scmi/scmi_common.c		\
 				drivers/arm/css/scmi/scmi_pwr_dmn_proto.c	\
 				drivers/arm/css/scmi/scmi_sys_pwr_proto.c	\
+				drivers/delay_timer/delay_timer.c		\
 				drivers/arm/css/scp/css_pm_scmi.c
 endif
 
diff --git a/plat/arm/css/common/sp_min/css_sp_min.mk b/plat/arm/css/common/sp_min/css_sp_min.mk
index 6523a16..ae489fd 100644
--- a/plat/arm/css/common/sp_min/css_sp_min.mk
+++ b/plat/arm/css/common/sp_min/css_sp_min.mk
@@ -15,6 +15,7 @@
 else
 BL32_SOURCES		+=	drivers/arm/css/mhu/css_mhu_doorbell.c		\
 				drivers/arm/css/scp/css_pm_scmi.c		\
+				drivers/delay_timer/delay_timer.c		\
 				drivers/arm/css/scmi/scmi_common.c		\
 				drivers/arm/css/scmi/scmi_pwr_dmn_proto.c	\
 				drivers/arm/css/scmi/scmi_sys_pwr_proto.c