diff --git a/std/src/sys/hermit/fs.rs b/std/src/sys/hermit/fs.rs
index c966f2177..cf0b27176 100644
--- a/std/src/sys/hermit/fs.rs
+++ b/std/src/sys/hermit/fs.rs
@@ -202,7 +202,7 @@ impl OpenOptions {
             create: false,
             create_new: false,
             // system-specific
-            mode: 0x777,
+            mode: 0o777,
         }
     }