diff --git a/codex-rs/exec-server-protocol/src/protocol.rs b/codex-rs/exec-server-protocol/src/protocol.rs
index 07d7b586c4..8c171eabd9 100644
--- a/codex-rs/exec-server-protocol/src/protocol.rs
+++ b/codex-rs/exec-server-protocol/src/protocol.rs
@@ -194,7 +194,7 @@ impl EnvironmentInfo {
                 environment_config_read: true,
                 http_header_env_vars: true,
                 sandboxed_file_streaming: true,
-                shell_snapshot_v2: false,
+                shell_snapshot_v2: cfg!(unix),
             },
         }
     }