diff --git a/fs/binfs/fs_binfs.c b/fs/binfs/fs_binfs.c
index 81b960f5a0e..f59e4518335 100644
--- a/fs/binfs/fs_binfs.c
+++ b/fs/binfs/fs_binfs.c
@@ -193,7 +193,7 @@ static ssize_t binfs_read(FAR struct file *filep,
 {
   /* Reading is not supported.  Just return end-of-file */
 
-  finfo("Read %d bytes from offset %d\n", buflen, filep->f_pos);
+  finfo("Read %zu bytes from offset %d\n", buflen, filep->f_pos);
   return 0;
 }