diff --git a/components/external/libpng/pngconf.h b/components/external/libpng/pngconf.h
index 611a0439bcf8aab89b2c7e69837e641e77d5f683..0cc2fc3551dc3319632187339a65193b8548cd96 100644
--- a/components/external/libpng/pngconf.h
+++ b/components/external/libpng/pngconf.h
@@ -20,13 +20,17 @@
 #define __RT_THREAD__
 
 #ifdef __RT_THREAD__
+#include <rtthread.h>
+#define PNG_MAX_MALLOC_64K
+
+#ifndef RT_USING_NEWLIB
 #define PNG_NO_WRITE_SUPPORTED
 #define PNG_NO_STDIO
 #define PNG_NO_SETJMP_SUPPORTED
-#define PNG_MAX_MALLOC_64K
 #define malloc	rtgui_malloc
 #define free	rtgui_free
 #endif
+#endif
 
 #define PNG_1_2_X