diff --git a/maint/add_warning b/maint/add_warning
index 97a6df8f5..d0ed2cdd7 100755
--- a/maint/add_warning
+++ b/maint/add_warning
@@ -61,6 +61,7 @@ TEST_LINTS = """
 #![allow(clippy::single_char_pattern)]
 #![allow(clippy::unwrap_used)]
 #![allow(clippy::unchecked_duration_subtraction)]
+#![allow(clippy::useless_vec)]
 """
 
 # ---------- some notes about lints we might use - NOT USED by any code here ----------