diff --git a/asyncgit/src/lib.rs b/asyncgit/src/lib.rs
index f9269939..3794fbb7 100644
--- a/asyncgit/src/lib.rs
+++ b/asyncgit/src/lib.rs
@@ -5,6 +5,7 @@
 #![deny(clippy::all)]
 #![deny(clippy::unwrap_used)]
 #![deny(clippy::panic)]
+#![deny(clippy::perf)]
 
 pub mod cached;
 mod commit_files;
diff --git a/scopetime/src/lib.rs b/scopetime/src/lib.rs
index f863013f..eb48ebb6 100644
--- a/scopetime/src/lib.rs
+++ b/scopetime/src/lib.rs
@@ -3,6 +3,7 @@
 #![forbid(unsafe_code)]
 #![forbid(missing_docs)]
 #![deny(clippy::unwrap_used)]
+#![deny(clippy::perf)]
 
 use std::time::Instant;
 
diff --git a/src/keys.rs b/src/keys.rs
index 00b9b46d..3a28020e 100644
--- a/src/keys.rs
+++ b/src/keys.rs
@@ -216,7 +216,7 @@ pub fn get_hint(ev: KeyEvent) -> String {
         KeyCode::F(u) => {
             format!("{}F{}", get_modifier_hint(ev.modifiers), u)
         }
-        KeyCode::Null => get_modifier_hint(ev.modifiers).to_string(),
+        KeyCode::Null => get_modifier_hint(ev.modifiers),
     }
 }
 
diff --git a/src/main.rs b/src/main.rs
index 523fc342..911ed11f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 #![forbid(unsafe_code)]
 #![deny(clippy::cargo)]
 #![deny(clippy::pedantic)]
+#![deny(clippy::perf)]
 #![deny(clippy::nursery)]
 #![deny(clippy::unwrap_used)]
 #![deny(clippy::panic)]