diff --git a/src/blob.rs b/src/blob.rs
index 3f67c2b52..19e09af29 100644
--- a/src/blob.rs
+++ b/src/blob.rs
@@ -740,7 +740,6 @@ fn add_white_bg(img: &mut DynamicImage) {
 #[cfg(test)]
 mod tests {
     use fs::File;
-    use image::Pixel;
 
     use super::*;
     use crate::chat::{self, create_group_chat, ProtectionStatus};
diff --git a/src/chat.rs b/src/chat.rs
index e71427c24..edb7d8209 100644
--- a/src/chat.rs
+++ b/src/chat.rs
@@ -1439,7 +1439,7 @@ impl rusqlite::types::ToSql for ChatId {
 impl rusqlite::types::FromSql for ChatId {
     fn column_result(value: rusqlite::types::ValueRef) -> rusqlite::types::FromSqlResult<Self> {
         i64::column_result(value).and_then(|val| {
-            if 0 <= val && val <= i64::from(std::u32::MAX) {
+            if 0 <= val && val <= i64::from(u32::MAX) {
                 Ok(ChatId::new(val as u32))
             } else {
                 Err(rusqlite::types::FromSqlError::OutOfRange(val))
diff --git a/src/message.rs b/src/message.rs
index 4bfad2d56..4a4eaa621 100644
--- a/src/message.rs
+++ b/src/message.rs
@@ -362,7 +362,7 @@ impl rusqlite::types::FromSql for MsgId {
     fn column_result(value: rusqlite::types::ValueRef) -> rusqlite::types::FromSqlResult<Self> {
         // Would be nice if we could use match here, but alas.
         i64::column_result(value).and_then(|val| {
-            if 0 <= val && val <= i64::from(std::u32::MAX) {
+            if 0 <= val && val <= i64::from(u32::MAX) {
                 Ok(MsgId::new(val as u32))
             } else {
                 Err(rusqlite::types::FromSqlError::OutOfRange(val))
diff --git a/src/mimefactory.rs b/src/mimefactory.rs
index 2ac1f02bc..265bc4d68 100644
--- a/src/mimefactory.rs
+++ b/src/mimefactory.rs
@@ -1586,9 +1586,8 @@ mod tests {
     use std::str;
 
     use super::*;
-    use crate::chat::ChatId;
     use crate::chat::{
-        self, add_contact_to_chat, create_group_chat, remove_contact_from_chat, send_text_msg,
+        add_contact_to_chat, create_group_chat, remove_contact_from_chat, send_text_msg, ChatId,
         ProtectionStatus,
     };
     use crate::chatlist::Chatlist;
diff --git a/src/receive_imf/tests.rs b/src/receive_imf/tests.rs
index 781b195b7..8ea32a2a6 100644
--- a/src/receive_imf/tests.rs
+++ b/src/receive_imf/tests.rs
@@ -9,7 +9,7 @@ use crate::chat::{
     ChatVisibility,
 };
 use crate::chatlist::Chatlist;
-use crate::constants::{ShowEmails, DC_GCL_FOR_FORWARDING, DC_GCL_NO_SPECIALS};
+use crate::constants::{DC_GCL_FOR_FORWARDING, DC_GCL_NO_SPECIALS};
 use crate::download::MIN_DOWNLOAD_LIMIT;
 use crate::imap::prefetch_should_download;
 use crate::imex::{imex, ImexMode};
diff --git a/src/test_utils.rs b/src/test_utils.rs
index af6888be2..900fd48dd 100644
--- a/src/test_utils.rs
+++ b/src/test_utils.rs
@@ -1056,8 +1056,10 @@ pub(crate) async fn mark_as_verified(this: &TestContext, other: &TestContext) {
         0,
     );
 
-    peerstate.verified_key = peerstate.public_key.clone();
-    peerstate.verified_key_fingerprint = peerstate.public_key_fingerprint.clone();
+    peerstate.verified_key.clone_from(&peerstate.public_key);
+    peerstate
+        .verified_key_fingerprint
+        .clone_from(&peerstate.public_key_fingerprint);
     peerstate.backward_verified_key_id = Some(this.get_config_i64(Config::KeyId).await.unwrap());
 
     peerstate.save_to_db(&this.sql).await.unwrap();