diff --git a/tests/test_backtrace.rs b/tests/test_backtrace.rs
index 2a4cffa..cc25676 100644
--- a/tests/test_backtrace.rs
+++ b/tests/test_backtrace.rs
@@ -1,3 +1,4 @@
+#![cfg(feature = "std")]
 #![cfg_attr(thiserror_nightly_testing, feature(error_generic_member_access))]
 
 use thiserror::Error;
diff --git a/tests/test_option.rs b/tests/test_option.rs
index fbdbec0..21cd5e1 100644
--- a/tests/test_option.rs
+++ b/tests/test_option.rs
@@ -1,3 +1,4 @@
+#![cfg(feature = "std")]
 #![cfg_attr(thiserror_nightly_testing, feature(error_generic_member_access))]
 
 #[cfg(thiserror_nightly_testing)]