diff --git a/Ubiquitous/XiZi/arch/arm/Makefile b/Ubiquitous/XiZi/arch/arm/Makefile
index c1a6ed745..4deddfcac 100644
--- a/Ubiquitous/XiZi/arch/arm/Makefile
+++ b/Ubiquitous/XiZi/arch/arm/Makefile
@@ -7,7 +7,7 @@ endif
 
 ifeq ($(CONFIG_BOARD_STM32F103_NANO),y)
 SRC_DIR := shared
-SRC_DIR +=cortex-m3
+SRC_DIR += cortex-m3
 endif
 
 ifeq ($(CONFIG_BOARD_STM32F407_EVB),y)
@@ -15,6 +15,11 @@ SRC_DIR := shared
 SRC_DIR += cortex-m4
 endif
 
+ifeq ($(CONFIG_BOARD_CORTEX_M4_EVB),y)
+SRC_DIR := shared
+SRC_DIR += cortex-m4
+endif
+
 ifeq ($(CONFIG_BOARD_CORTEX_M7_EVB),y)
 SRC_DIR := shared
 SRC_DIR += cortex-m7