diff --git a/codex-rs/windows-sandbox-rs/Cargo.toml b/codex-rs/windows-sandbox-rs/Cargo.toml
index eec3925ff..aa872035b 100644
--- a/codex-rs/windows-sandbox-rs/Cargo.toml
+++ b/codex-rs/windows-sandbox-rs/Cargo.toml
@@ -47,7 +47,7 @@ version = "0.8"
 [dependencies.dirs-next]
 version = "2.0"
 
-[dependencies.windows-sys]
+[target.'cfg(windows)'.dependencies.windows-sys]
 features = [
     "Win32_Foundation",
     "Win32_System_Diagnostics_Debug",