diff --git a/proxmox-api-macro/src/api/method.rs b/proxmox-api-macro/src/api/method.rs
index 927030f3..f82cc53a 100644
--- a/proxmox-api-macro/src/api/method.rs
+++ b/proxmox-api-macro/src/api/method.rs
@@ -356,7 +356,7 @@ fn handle_function_signature(
                 // Found an explicit parameter: extract it:
                 ParameterType::Normal(NormalParameter {
                     ty: &pat_type.ty,
-                    entry: &entry,
+                    entry,
                 })
             } else if is_api_method_type(&pat_type.ty) {
                 if api_method_param.is_some() {
@@ -567,7 +567,7 @@ fn extract_normal_parameter(
 ) -> Result<(), Error> {
     let span = name_span; // renamed during refactorization
     let name_str = syn::LitStr::new(name.as_str(), span);
-    let arg_name = Ident::new(&format!("input_arg_{}", name.as_ident().to_string()), span);
+    let arg_name = Ident::new(&format!("input_arg_{}", name.as_ident()), span);
 
     let default_value = param.entry.schema.find_schema_property("default");
 
diff --git a/proxmox-api-macro/src/api/mod.rs b/proxmox-api-macro/src/api/mod.rs
index 18ffdac3..bf8eeac5 100644
--- a/proxmox-api-macro/src/api/mod.rs
+++ b/proxmox-api-macro/src/api/mod.rs
@@ -443,7 +443,7 @@ pub enum OptionType {
 
     /// An updater type uses its "base" type's field's updaters to determine whether the field is
     /// supposed to be an option.
-    Updater(syn::Type),
+    Updater(Box<syn::Type>),
 }
 
 impl OptionType {
@@ -465,7 +465,7 @@ impl From<bool> for OptionType {
 
 impl From<syn::Type> for OptionType {
     fn from(ty: syn::Type) -> Self {
-        OptionType::Updater(ty)
+        OptionType::Updater(Box::new(ty))
     }
 }
 
diff --git a/proxmox-api-macro/src/serde.rs b/proxmox-api-macro/src/serde.rs
index 7df2fe7a..d7f55018 100644
--- a/proxmox-api-macro/src/serde.rs
+++ b/proxmox-api-macro/src/serde.rs
@@ -8,6 +8,7 @@ use std::convert::TryFrom;
 use crate::util::{AttrArgs, FieldName};
 
 /// Serde name types.
+#[allow(clippy::enum_variant_names)]
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub enum RenameAll {
     LowerCase,
diff --git a/proxmox-api-macro/src/util.rs b/proxmox-api-macro/src/util.rs
index 77e0098d..002e3e92 100644
--- a/proxmox-api-macro/src/util.rs
+++ b/proxmox-api-macro/src/util.rs
@@ -561,7 +561,7 @@ pub fn make_path(span: Span, leading_colon: bool, path: &[&str]) -> syn::Path {
             None
         },
         segments: path
-            .into_iter()
+            .iter()
             .map(|entry| syn::PathSegment {
                 ident: Ident::new(entry, span),
                 arguments: syn::PathArguments::None,
@@ -682,9 +682,9 @@ impl<T> Maybe<T> {
     }
 }
 
-impl<T> Into<Option<T>> for Maybe<T> {
-    fn into(self) -> Option<T> {
-        match self {
+impl<T> From<Maybe<T>> for Option<T> {
+    fn from(maybe: Maybe<T>) -> Option<T> {
+        match maybe {
             Maybe::Explicit(t) | Maybe::Derived(t) => Some(t),
             Maybe::None => None,
         }
@@ -694,7 +694,7 @@ impl<T> Into<Option<T>> for Maybe<T> {
 /// Helper to iterate over all the `#[derive(...)]` types found in an attribute list.
 pub fn derived_items(attributes: &[syn::Attribute]) -> DerivedItems {
     DerivedItems {
-        attributes: attributes.into_iter(),
+        attributes: attributes.iter(),
         current: None,
     }
 }