diff --git a/components/dfs/include/dfs_def.h b/components/dfs/include/dfs_def.h
index fed58ac01..0651813c9 100644
--- a/components/dfs/include/dfs_def.h
+++ b/components/dfs/include/dfs_def.h
@@ -174,15 +174,15 @@
 #define DFS_STATUS_ENOTEMPTY	39		/* Directory not empty */
 
 /* Operation flags */
-#define DFS_O_RDONLY		0000000
-#define DFS_O_WRONLY		0000001
-#define DFS_O_RDWR			0000002
-#define DFS_O_ACCMODE		0000003
-#define DFS_O_CREAT			0000100
-#define DFS_O_EXCL			0000200
-#define DFS_O_TRUNC			0001000
-#define DFS_O_APPEND		0002000
-#define DFS_O_DIRECTORY		0200000
+#define DFS_O_RDONLY		0x0000000
+#define DFS_O_WRONLY		0x0000001
+#define DFS_O_RDWR			0x0000002
+#define DFS_O_ACCMODE		0x0000003
+#define DFS_O_CREAT			0x0000100
+#define DFS_O_EXCL			0x0000200
+#define DFS_O_TRUNC			0x0001000
+#define DFS_O_APPEND		0x0002000
+#define DFS_O_DIRECTORY		0x0200000
 
 /* File flags */
 #define DFS_F_OPEN			0x01000000
diff --git a/components/libc/newlib/sys/fcntl.h b/components/libc/newlib/sys/fcntl.h
index 3638029eb..a65fb5257 100644
--- a/components/libc/newlib/sys/fcntl.h
+++ b/components/libc/newlib/sys/fcntl.h
@@ -2,14 +2,14 @@
 #define __RTT_FCNTL_H__
 
 /* Operation flags */
-#define O_RDONLY		0000000
-#define O_WRONLY		0000001
-#define O_RDWR			0000002
-#define O_ACCMODE		0000003
-#define O_CREAT			0000100
-#define O_EXCL			0000200
-#define O_TRUNC			0001000
-#define O_APPEND		0002000
-#define O_DIRECTORY		0200000
+#define O_RDONLY		0x0000000
+#define O_WRONLY		0x0000001
+#define O_RDWR			0x0000002
+#define O_ACCMODE		0x0000003
+#define O_CREAT			0x0000100
+#define O_EXCL			0x0000200
+#define O_TRUNC			0x0001000
+#define O_APPEND		0x0002000
+#define O_DIRECTORY		0x0200000
 
 #endif