diff --git a/crates/tests/winrt/reference_float/src/lib.rs b/crates/tests/winrt/reference_float/src/lib.rs
index 8371b8a472..3ec53ddfa0 100644
--- a/crates/tests/winrt/reference_float/src/lib.rs
+++ b/crates/tests/winrt/reference_float/src/lib.rs
@@ -1,3 +1,5 @@
+#![cfg(test)]
+
 mod bindings;
 use bindings::*;
 use windows::{core::*, Foundation::*};