diff --git a/library/std/src/sys/hermit/fs.rs b/library/std/src/sys/hermit/fs.rs
index c966f21775727..cf0b271761feb 100644
--- a/library/std/src/sys/hermit/fs.rs
+++ b/library/std/src/sys/hermit/fs.rs
@@ -202,7 +202,7 @@ impl OpenOptions {
             create: false,
             create_new: false,
             // system-specific
-            mode: 0x777,
+            mode: 0o777,
         }
     }