diff --git a/components/dfs/include/dfs_posix.h b/components/dfs/include/dfs_posix.h
index 3e6f5f180d7dbec785bb9feae9de9a813d605cc9..2e417c1461c9fb741d238ee6196aec4c85ff75ee 100644
--- a/components/dfs/include/dfs_posix.h
+++ b/components/dfs/include/dfs_posix.h
@@ -134,7 +134,7 @@ int unlink(const char *pathname);
 int stat(const char *file, struct stat *buf);
 int fstat(int fildes, struct stat *buf);
 int fsync(int fildes);
-int ioctl(int fildes, unsigned long cmd, void *data);
+int ioctl(int fildes, long cmd, void *data);
 
 /* directory api*/
 int rmdir(const char *path);
diff --git a/components/dfs/src/dfs_posix.c b/components/dfs/src/dfs_posix.c
index 58db600eb85eb1e768e1889026f4aa77bc3d2ae0..0f1d9569e66bb2ec065c5cea0754128844f2d7e9 100644
--- a/components/dfs/src/dfs_posix.c
+++ b/components/dfs/src/dfs_posix.c
@@ -427,7 +427,7 @@ RTM_EXPORT(fsync);
  * @return 0 on successful completion. Otherwise, -1 shall be returned and errno
  * set to indicate the error.
  */
-int ioctl(int fildes, unsigned long cmd, void *data)
+int ioctl(int fildes, long cmd, void *data)
 {
 	int ret;
     struct dfs_fd *d;