diff --git a/boot/arm-trusted-firmware/arm-trusted-firmware.mk b/boot/arm-trusted-firmware/arm-trusted-firmware.mk
index 35a95a7ec2..1ac645c793 100644
--- a/boot/arm-trusted-firmware/arm-trusted-firmware.mk
+++ b/boot/arm-trusted-firmware/arm-trusted-firmware.mk
@@ -191,8 +191,8 @@ endef
 ifeq ($(BR2_TARGET_ARM_TRUSTED_FIRMWARE)$(BR_BUILDING),yy)
 
 ifeq ($(ARM_TRUSTED_FIRMWARE_VERSION),custom)
-ifeq ($(call qstrip,$(BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_TARBALL_LOCATION))),)
-$(error No tarball location specified. Please check BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_TARBALL_LOCATION))
+ifeq ($(call qstrip,$(BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_TARBALL_LOCATION)),)
+$(error No tarball location specified. Please check BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_TARBALL_LOCATION)
 endif
 endif