diff --git a/fs/userfs/fs_userfs.c b/fs/userfs/fs_userfs.c
index 4514ce326e..9741e5740e 100644
--- a/fs/userfs/fs_userfs.c
+++ b/fs/userfs/fs_userfs.c
@@ -86,7 +86,7 @@ struct userfs_state_s
 
   struct socket psock;       /* Client socket instance */
   struct sockaddr_in server; /* Server address */
-  sem_t exclsem;             /* Exlusive access for request-response sequence */
+  sem_t exclsem;             /* Exclusive access for request-response sequence */
 
   /* I/O Buffer (actual size depends on USERFS_REQ_MAXSIZE and the configured
    * mxwrite).
diff --git a/include/nuttx/fs/userfs.h b/include/nuttx/fs/userfs.h
index 413fe31bdd..8eee64efc6 100644
--- a/include/nuttx/fs/userfs.h
+++ b/include/nuttx/fs/userfs.h
@@ -154,7 +154,7 @@ enum userfs_req_e
 };
 
 /* This enumeration provides the type of each response returned from the
- * user file system to OS file system client to the .
+ * user file system to OS file system client.
  */
 
 enum userfs_resp_e
@@ -213,7 +213,7 @@ struct userfs_operations_s
   int     (*ioctl)(FAR void *volinfo, FAR void *openinfo, int cmd,
             unsigned long arg);
   int     (*sync)(FAR void *volinfo, FAR void *openinfo);
-  int     (*dup)(FAR void *volinfo, FAR void *oldinfo, FAR void *newinfo);
+  int     (*dup)(FAR void *volinfo, FAR void *oldinfo, FAR void **newinfo);
   int     (*fstat)(FAR void *volinfo, FAR void *openinfo,
             FAR struct stat *buf);
   int     (*opendir)(FAR void *volinfo, FAR const char *relpath,