diff --git a/codegen/src/generate/into/normal.rs b/codegen/src/generate/into/normal.rs
index ee97f80..a96598e 100644
--- a/codegen/src/generate/into/normal.rs
+++ b/codegen/src/generate/into/normal.rs
@@ -12,7 +12,7 @@ pub(crate) fn impl_into(params: &Parameters, fields: Vec<(Field, Field)>) -> Tok
     let mut functions_tokens = TokenStream::new();
 
     // Add `merge_ref` impl.
-    let stream = merge_ref(params, fields.clone());
+    let stream = merge_ref(params, fields);
     functions_tokens.extend(vec![stream]);
 
     // Surround functions with `impl` block.
diff --git a/codegen/src/generate/merge/borrowed.rs b/codegen/src/generate/merge/borrowed.rs
index 7d6ea31..8f4f8da 100644
--- a/codegen/src/generate/merge/borrowed.rs
+++ b/codegen/src/generate/merge/borrowed.rs
@@ -12,7 +12,7 @@ pub(crate) fn impl_borrowed(params: &Parameters, fields: Vec<(Field, Field)>) ->
     let mut functions_tokens = TokenStream::new();
 
     // Add `merge_ref` impl.
-    let stream = merge_ref(params, fields.clone());
+    let stream = merge_ref(params, fields);
     functions_tokens.extend(vec![stream]);
 
     // Surround functions with `impl` block.
diff --git a/codegen/src/generate/merge/owned.rs b/codegen/src/generate/merge/owned.rs
index ec49274..e68e529 100644
--- a/codegen/src/generate/merge/owned.rs
+++ b/codegen/src/generate/merge/owned.rs
@@ -12,7 +12,7 @@ pub(crate) fn impl_owned(params: &Parameters, fields: Vec<(Field, Field)>) -> To
     let mut functions_tokens = TokenStream::new();
 
     // Add `merge` impl.
-    let stream = merge(params, fields.clone());
+    let stream = merge(params, fields);
     functions_tokens.extend(vec![stream]);
 
     // Surround functions with `impl` block.