diff --git a/test/unit-test/FreeRTOS_IPv6/ut.cmake b/test/unit-test/FreeRTOS_IPv6/ut.cmake
index 776178a64..06e19fe17 100644
--- a/test/unit-test/FreeRTOS_IPv6/ut.cmake
+++ b/test/unit-test/FreeRTOS_IPv6/ut.cmake
@@ -15,10 +15,10 @@ list(APPEND mock_list
             "${MODULE_ROOT_DIR}/test/FreeRTOS-Kernel/include/queue.h"
             "${MODULE_ROOT_DIR}/test/FreeRTOS-Kernel/include/event_groups.h"
             "${CMAKE_BINARY_DIR}/Annexed_TCP/NetworkBufferManagement.h"
-			"${CMAKE_BINARY_DIR}/Annexed_TCP/FreeRTOS_IP.h"
+            "${CMAKE_BINARY_DIR}/Annexed_TCP/FreeRTOS_IP.h"
             "${CMAKE_BINARY_DIR}/Annexed_TCP/FreeRTOS_IPv6_Utils.h"
-			"${CMAKE_BINARY_DIR}/Annexed_TCP/FreeRTOS_IP_Private.h"
-			"${CMAKE_BINARY_DIR}/Annexed_TCP/FreeRTOS_Routing.h"
+            "${CMAKE_BINARY_DIR}/Annexed_TCP/FreeRTOS_IP_Private.h"
+            "${CMAKE_BINARY_DIR}/Annexed_TCP/FreeRTOS_Routing.h"
         )
 
 set(mock_include_list "")