diff --git a/nshlib/nsh_ddcmd.c b/nshlib/nsh_ddcmd.c
index 3890616e8..f9ac66901 100644
--- a/nshlib/nsh_ddcmd.c
+++ b/nshlib/nsh_ddcmd.c
@@ -188,9 +188,12 @@ static int dd_verify(FAR const char *infile, FAR const char *outfile,
                      FAR struct dd_s *dd)
 {
   FAR uint8_t *buffer;
-  int sector = 0;
+  unsigned sector = 0;
   int ret = OK;
 
+  UNUSED(infile);
+  UNUSED(outfile);
+
   ret = lseek(dd->infd, dd->skip ? dd->skip * dd->sectsize : 0, SEEK_SET);
   if (ret < 0)
     {