diff --git a/components/dfs/src/dfs.c b/components/dfs/src/dfs.c
index 7e56137abab4447a395ae31aba4985c7101a9901..f5176b747758da8319f1cf9c1e6903ce8891ea3e 100644
--- a/components/dfs/src/dfs.c
+++ b/components/dfs/src/dfs.c
@@ -284,6 +284,7 @@ const char *dfs_subdir(const char *directory, const char *filename)
 
     return dir;
 }
+RTM_EXPORT(dfs_subdir);
 
 /**
  * this function will normalize a path according to specified parent directory
@@ -410,5 +411,7 @@ up_one:
 
     return fullpath;
 }
+RTM_EXPORT(dfs_normalize_path);
+
 /*@}*/