diff --git a/plat/arm/common/arm_common.mk b/plat/arm/common/arm_common.mk
index a287368..a92bf25 100644
--- a/plat/arm/common/arm_common.mk
+++ b/plat/arm/common/arm_common.mk
@@ -298,6 +298,8 @@
     # Include the selected chain of trust sources.
     ifeq (${COT},tbbr)
         AUTH_SOURCES	+=	drivers/auth/tbbr/tbbr_cot_common.c
+	BL1_SOURCES     +=      drivers/auth/tbbr/tbbr_cot_bl1.c
+	BL2_SOURCES     +=      drivers/auth/tbbr/tbbr_cot_bl2.c
     else ifeq (${COT},dualroot)
         AUTH_SOURCES	+=	drivers/auth/dualroot/cot.c
     else
@@ -307,12 +309,10 @@
     BL1_SOURCES		+=	${AUTH_SOURCES}					\
 				bl1/tbbr/tbbr_img_desc.c			\
 				plat/arm/common/arm_bl1_fwu.c			\
-				drivers/auth/tbbr/tbbr_cot_bl1.c		\
 				plat/common/tbbr/plat_tbbr.c
 
     BL2_SOURCES		+=	${AUTH_SOURCES}					\
-				plat/common/tbbr/plat_tbbr.c			\
-				drivers/auth/tbbr/tbbr_cot_bl2.c
+				plat/common/tbbr/plat_tbbr.c
 
     $(eval $(call TOOL_ADD_IMG,ns_bl2u,--fwu,FWU_))