diff --git a/tests/test_datetime.rs b/tests/test_datetime.rs
index 25843bed..e929029b 100644
--- a/tests/test_datetime.rs
+++ b/tests/test_datetime.rs
@@ -4,6 +4,7 @@ use pyo3::ffi::*;
 use pyo3::prelude::*;
 use pyo3::types::{IntoPyDict, PyAny};
 
+#[allow(clippy::trivially_copy_pass_by_ref)]
 fn _get_subclasses<'p>(
     py: &'p Python,
     py_type: &str,