diff --git a/drivers/block/rnull/configfs.rs b/drivers/block/rnull/configfs.rs
index 24b02256b4cd..34ef96fa125f 100644
--- a/drivers/block/rnull/configfs.rs
+++ b/drivers/block/rnull/configfs.rs
@@ -47,7 +47,7 @@ impl AttributeOperations<0> for Config {
 
     fn show(_this: &Config, page: &mut [u8; PAGE_SIZE]) -> Result<usize> {
         let mut writer = kernel::str::Formatter::new(page);
-        writer.write_str("blocksize,size,rotational,irqmode\n")?;
+        writer.write_str("blocksize,size,rotational,irqmode,power\n")?;
         Ok(writer.bytes_written())
     }
 }