diff --git a/serde_derive/src/lib.rs b/serde_derive/src/lib.rs
index 9bf2c364..1773b7a3 100644
--- a/serde_derive/src/lib.rs
+++ b/serde_derive/src/lib.rs
@@ -24,6 +24,7 @@
     // clippy bug: https://github.com/rust-lang/rust-clippy/issues/7575
     clippy::collapsible_match,
     clippy::enum_variant_names,
+    clippy::if_then_panic,
     // clippy bug: https://github.com/rust-lang/rust-clippy/issues/6797
     clippy::manual_map,
     clippy::match_like_matches_macro,
diff --git a/serde_derive_internals/lib.rs b/serde_derive_internals/lib.rs
index aa00e3b1..fa51c365 100644
--- a/serde_derive_internals/lib.rs
+++ b/serde_derive_internals/lib.rs
@@ -6,6 +6,7 @@
     clippy::cognitive_complexity,
     // clippy bug: https://github.com/rust-lang/rust-clippy/issues/7575
     clippy::collapsible_match,
+    clippy::if_then_panic,
     // clippy bug: https://github.com/rust-lang/rust-clippy/issues/6797
     clippy::manual_map,
     clippy::missing_panics_doc,
diff --git a/serde_test/src/lib.rs b/serde_test/src/lib.rs
index a443026f..34e2fdd0 100644
--- a/serde_test/src/lib.rs
+++ b/serde_test/src/lib.rs
@@ -155,6 +155,7 @@
     allow(
         cloned_instead_of_copied,
         empty_line_after_outer_attr,
+        if_then_panic,
         missing_docs_in_private_items,
         missing_panics_doc,
         module_name_repetitions,
diff --git a/test_suite/tests/test_de.rs b/test_suite/tests/test_de.rs
index e1a6ea21..15b5d388 100644
--- a/test_suite/tests/test_de.rs
+++ b/test_suite/tests/test_de.rs
@@ -1,4 +1,8 @@
-#![allow(clippy::decimal_literal_representation, clippy::unreadable_literal)]
+#![allow(
+    clippy::decimal_literal_representation,
+    clippy::if_then_panic,
+    clippy::unreadable_literal
+)]
 #![cfg_attr(feature = "unstable", feature(never_type))]
 
 use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};