diff --git a/drivers/staging/android/ashmem_rust.rs b/drivers/staging/android/ashmem_rust.rs
index 3b31d5d8fcfc..8021380c8ed8 100644
--- a/drivers/staging/android/ashmem_rust.rs
+++ b/drivers/staging/android/ashmem_rust.rs
@@ -258,7 +258,7 @@ impl MiscDevice for Ashmem {
                 me.pin_unpin(cmd, UserSlice::new(arg, size).reader())
             }
             bindings::ASHMEM_PURGE_ALL_CACHES => me.purge_all_caches(),
-            _ => Err(EINVAL),
+            _ => Err(ENOTTY),
         }
     }