diff --git a/rust/hg-cpython/src/dirstate/status.rs b/rust/hg-cpython/src/dirstate/status.rs
--- a/rust/hg-cpython/src/dirstate/status.rs
+++ b/rust/hg-cpython/src/dirstate/status.rs
@@ -10,6 +10,7 @@
 //! `rustext.dirstate.status`.
 
 use crate::{dirstate::DirstateMap, exceptions::FallbackError};
+use cpython::exc::OSError;
 use cpython::{
     exc::ValueError, ObjectProtocol, PyBytes, PyErr, PyList, PyObject,
     PyResult, PyTuple, Python, PythonObject, ToPyObject,
@@ -89,6 +90,7 @@ fn handle_fallback(py: Python, err: Stat
 
             PyErr::new::<FallbackError, _>(py, &as_string)
         }
+        StatusError::IO(e) => PyErr::new::<OSError, _>(py, e.to_string()),
         e => PyErr::new::<ValueError, _>(py, e.to_string()),
     }
 }