diff --git a/codex-rs/core/src/exec_policy_tests.rs b/codex-rs/core/src/exec_policy_tests.rs
index ca23daff1..f17869205 100644
--- a/codex-rs/core/src/exec_policy_tests.rs
+++ b/codex-rs/core/src/exec_policy_tests.rs
@@ -1343,7 +1343,7 @@ prefix_rule(pattern=["cat"], decision="allow")
                 policy_src: Some(policy_src.to_string()),
                 command: command.clone(),
                 approval_policy,
-                sandbox_policy: SandboxPolicy::new_read_only_policy(),
+                sandbox_policy: SandboxPolicy::new_workspace_write_policy(),
                 file_system_sandbox_policy: read_only_file_system_sandbox_policy(),
                 sandbox_permissions: SandboxPermissions::UseDefault,
                 prefix_rule: None,