diff --git a/buffyboard/lv_conf.defaults b/buffyboard/lv_conf.defaults
index 4f64968..ef35890 100644
--- a/buffyboard/lv_conf.defaults
+++ b/buffyboard/lv_conf.defaults
@@ -5,6 +5,10 @@
 # 2. Add `#define LV_FONT_CUSTOM_DECLARE LV_FONT_DECLARE(bbx_font_32)` (a bug in generate_lv_conf.py)
 
 LV_COLOR_DEPTH	32
+LV_USE_STDLIB_MALLOC	LV_STDLIB_CLIB
+LV_USE_STDLIB_STRING	LV_STDLIB_CLIB
+LV_USE_STDLIB_SPRINTF	LV_STDLIB_CLIB
+
 LV_USE_DRAW_SW	1
 LV_DRAW_SW_COMPLEX	1
 LV_DRAW_SW_SUPPORT_RGB565	0
diff --git a/buffyboard/lv_conf.h b/buffyboard/lv_conf.h
index e87e587..b8ceb27 100644
--- a/buffyboard/lv_conf.h
+++ b/buffyboard/lv_conf.h
@@ -39,9 +39,9 @@
  * - LV_STDLIB_RTTHREAD:    RT-Thread implementation
  * - LV_STDLIB_CUSTOM:      Implement the functions externally
  */
-#define LV_USE_STDLIB_MALLOC    LV_STDLIB_BUILTIN
-#define LV_USE_STDLIB_STRING    LV_STDLIB_BUILTIN
-#define LV_USE_STDLIB_SPRINTF   LV_STDLIB_BUILTIN
+#define LV_USE_STDLIB_MALLOC    LV_STDLIB_CLIB
+#define LV_USE_STDLIB_STRING    LV_STDLIB_CLIB
+#define LV_USE_STDLIB_SPRINTF   LV_STDLIB_CLIB
 
 #define LV_STDINT_INCLUDE       <stdint.h>
 #define LV_STDDEF_INCLUDE       <stddef.h>
diff --git a/unl0kr/lv_conf.defaults b/unl0kr/lv_conf.defaults
index c56422b..2dfe12e 100644
--- a/unl0kr/lv_conf.defaults
+++ b/unl0kr/lv_conf.defaults
@@ -6,6 +6,10 @@
 # 3. Add `#define LV_FONT_CUSTOM_DECLARE LV_FONT_DECLARE(bbx_font_32)` (a bug in generate_lv_conf.py)
 
 LV_COLOR_DEPTH	32
+LV_USE_STDLIB_MALLOC	LV_STDLIB_CLIB
+LV_USE_STDLIB_STRING	LV_STDLIB_CLIB
+LV_USE_STDLIB_SPRINTF	LV_STDLIB_CLIB
+
 LV_USE_DRAW_SW	1
 LV_DRAW_SW_COMPLEX	1
 LV_DRAW_SW_SUPPORT_RGB565	0
diff --git a/unl0kr/lv_conf.h b/unl0kr/lv_conf.h
index 8ffc9af..73f2ff6 100644
--- a/unl0kr/lv_conf.h
+++ b/unl0kr/lv_conf.h
@@ -39,9 +39,9 @@
  * - LV_STDLIB_RTTHREAD:    RT-Thread implementation
  * - LV_STDLIB_CUSTOM:      Implement the functions externally
  */
-#define LV_USE_STDLIB_MALLOC    LV_STDLIB_BUILTIN
-#define LV_USE_STDLIB_STRING    LV_STDLIB_BUILTIN
-#define LV_USE_STDLIB_SPRINTF   LV_STDLIB_BUILTIN
+#define LV_USE_STDLIB_MALLOC    LV_STDLIB_CLIB
+#define LV_USE_STDLIB_STRING    LV_STDLIB_CLIB
+#define LV_USE_STDLIB_SPRINTF   LV_STDLIB_CLIB
 
 #define LV_STDINT_INCLUDE       <stdint.h>
 #define LV_STDDEF_INCLUDE       <stddef.h>