diff --git a/bench/src/stats.rs b/bench/src/stats.rs
index 71762a2fc..0c81875c9 100644
--- a/bench/src/stats.rs
+++ b/bench/src/stats.rs
@@ -2,6 +2,7 @@ use std::time::Duration;
 
 use hdrhistogram::Histogram;
 
+#[derive(Default)]
 pub struct Stats {
     pub total_size: usize,
     pub total_duration: Duration,
@@ -9,17 +10,6 @@ pub struct Stats {
     pub stream_stats: StreamStats,
 }
 
-impl Default for Stats {
-    fn default() -> Self {
-        Self {
-            total_size: Default::default(),
-            total_duration: Default::default(),
-            streams: Default::default(),
-            stream_stats: StreamStats::default(),
-        }
-    }
-}
-
 impl Stats {
     pub fn stream_finished(&mut self, stream_result: TransferResult) {
         self.total_size += stream_result.size;
diff --git a/fuzz/fuzz_targets/streams.rs b/fuzz/fuzz_targets/streams.rs
index 491f070cd..a8659e6e5 100644
--- a/fuzz/fuzz_targets/streams.rs
+++ b/fuzz/fuzz_targets/streams.rs
@@ -6,7 +6,6 @@ use libfuzzer_sys::fuzz_target;
 extern crate proto;
 use proto::fuzzing::{
     ConnectionState, ResetStream, Retransmits, SendStream, Streams, StreamsState,
-    TransportParameters,
 };
 use proto::{Dir, Side, StreamId, VarInt};
 
@@ -19,7 +18,6 @@ struct StreamParams {
     receive_window: u16,
     stream_receive_window: u16,
     dir: Dir,
-    transport_params: TransportParameters,
 }
 
 #[derive(Arbitrary, Debug)]
diff --git a/perf/src/stats.rs b/perf/src/stats.rs
index a0e201d88..2f6aa8bdb 100644
--- a/perf/src/stats.rs
+++ b/perf/src/stats.rs
@@ -261,7 +261,7 @@ mod json {
             intervals: &stats
                 .intervals
                 .iter()
-                .map(|interval| Interval::from_stats_interval(interval))
+                .map(Interval::from_stats_interval)
                 .collect(),
         };
 
diff --git a/quinn-proto/src/connection/spaces.rs b/quinn-proto/src/connection/spaces.rs
index 41043e829..e0f06c13f 100644
--- a/quinn-proto/src/connection/spaces.rs
+++ b/quinn-proto/src/connection/spaces.rs
@@ -221,7 +221,7 @@ pub(crate) struct SentPacket {
 }
 
 /// Retransmittable data queue
-#[derive(Debug, Clone)]
+#[derive(Debug, Default, Clone)]
 pub struct Retransmits {
     pub(crate) max_data: bool,
     pub(crate) max_uni_stream_id: bool,
@@ -253,23 +253,6 @@ impl Retransmits {
     }
 }
 
-impl Default for Retransmits {
-    fn default() -> Self {
-        Self {
-            max_data: false,
-            max_uni_stream_id: false,
-            max_bi_stream_id: false,
-            reset_stream: Vec::new(),
-            stop_sending: Vec::new(),
-            max_stream_data: FxHashSet::default(),
-            crypto: VecDeque::new(),
-            new_cids: Vec::new(),
-            retire_cids: Vec::new(),
-            handshake_done: false,
-        }
-    }
-}
-
 impl ::std::ops::BitOrAssign for Retransmits {
     fn bitor_assign(&mut self, rhs: Self) {
         // We reduce in-stream head-of-line blocking by queueing retransmits before other data for