diff --git a/components/newlib/platform_include/sys/dirent.h b/components/newlib/platform_include/sys/dirent.h
index 97e4bfed1c..4626ae14d2 100644
--- a/components/newlib/platform_include/sys/dirent.h
+++ b/components/newlib/platform_include/sys/dirent.h
@@ -42,7 +42,12 @@ struct dirent {
 #define DT_UNKNOWN  0
 #define DT_REG      1
 #define DT_DIR      2
-    char d_name[256];   /*!< zero-terminated file name */
+#if __BSD_VISIBLE
+#define MAXNAMLEN 255
+    char d_name[MAXNAMLEN+1];   /*!< zero-terminated file name */
+#else
+    char d_name[256];
+#endif
 };
 
 DIR* opendir(const char* name);