diff --git a/Cargo.toml b/Cargo.toml
index 0bf32b20486d..587b82231b86 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -183,6 +183,7 @@ map_clone = 'warn'
 uninlined_format_args = 'warn'
 unnecessary_to_owned = 'warn'
 manual_strip = 'warn'
+question_mark = 'warn'
 
 [workspace.dependencies]
 arbitrary = { version = "1.3.1" }