diff --git a/maint/add_warning b/maint/add_warning
index 95a996fbe..f25827812 100755
--- a/maint/add_warning
+++ b/maint/add_warning
@@ -67,6 +67,7 @@ TEST_LINTS = """
 #![allow(clippy::unwrap_used)]
 #![allow(clippy::unchecked_duration_subtraction)]
 #![allow(clippy::useless_vec)]
+#![allow(clippy::needless_pass_by_value)]
 """
 
 # ---------- some notes about lints we might use - NOT USED by any code here ----------