diff --git a/examples/lua/main.c b/examples/lua/main.c
index 5065683a..9c95ad8c 100644
--- a/examples/lua/main.c
+++ b/examples/lua/main.c
@@ -1,3 +1,4 @@
+#include <stdlib.h>
 #include "bflb_mtimer.h"
 #include "board.h"
 #include "vlibc_stdio.h"
diff --git a/examples/peripherals/timer/timer_int/main.c b/examples/peripherals/timer/timer_int/main.c
index 3a9c1342..727ba0b6 100644
--- a/examples/peripherals/timer/timer_int/main.c
+++ b/examples/peripherals/timer/timer_int/main.c
@@ -1,6 +1,7 @@
 #include "bflb_mtimer.h"
 #include "bflb_timer.h"
 #include "board.h"
+
 #define TEST_TIMER_COMP_ID TIMER_COMP_ID_2
 
 struct bflb_device_s *timer0;
diff --git a/utils/CMakeLists.txt b/utils/CMakeLists.txt
index 086f5eec..7b88397d 100644
--- a/utils/CMakeLists.txt
+++ b/utils/CMakeLists.txt
@@ -53,7 +53,7 @@ if(CONFIG_VLIBC)
         sdk_add_compile_definitions(-DCONFIG_VLIBC_FATFS)
     endif()
 
-    sdk_add_compile_definitions(-Dprintf=vlibc_printf)
+    # sdk_add_compile_definitions(-Dprintf=vlibc_printf)
     sdk_library_add_sources(vlibc/printf.c)
     sdk_library_add_sources(vlibc/syscalls.c)
     sdk_library_add_sources(vlibc/vlibc_stdio.c)