diff --git a/vm/src/stdlib/os.rs b/vm/src/stdlib/os.rs
index 818d0628be..1452e0f1f1 100644
--- a/vm/src/stdlib/os.rs
+++ b/vm/src/stdlib/os.rs
@@ -1932,7 +1932,7 @@ mod _os {
                 Err(io::Error::from(Errno::last()).into_pyexception(vm))
             }
         } else {
-            Ok(Some(raw))
+            Ok(Some(raw as i64))
         }
     }