diff --git a/pdf/src/build.rs b/pdf/src/build.rs
index b6d2040..e8e538b 100644
--- a/pdf/src/build.rs
+++ b/pdf/src/build.rs
@@ -7,15 +7,34 @@ use datasize::DataSize;
 
 use crate::PdfError;
 use crate::any::AnySync;
+use crate::content::{deep_clone_op, Content, Op};
 use crate::enc::StreamFilter;
+use crate::error::Result;
 use crate::file::Cache;
 use crate::file::FileOptions;
 use crate::file::Log;
 use crate::file::Storage;
 use crate::file::Trailer;
-use crate::object::*;
-use crate::content::*;
-use crate::error::Result;
+use crate::object::Catalog;
+use crate::object::Cloner;
+use crate::object::DeepClone;
+use crate::object::InfoDict;
+use crate::object::Object;
+use crate::object::ObjectWrite;
+use crate::object::Page;
+use crate::object::PageTree;
+use crate::object::PagesNode;
+use crate::object::PagesRc;
+use crate::object::ParseOptions;
+use crate::object::PlainRef;
+use crate::object::PromisedRef;
+use crate::object::RcRef;
+use crate::object::Rectangle;
+use crate::object::Ref;
+use crate::object::Resolve;
+use crate::object::Resources;
+use crate::object::Shared;
+use crate::object::Updater;
 use crate::parser::ParseFlags;
 use crate::primitive::Dictionary;
 use crate::primitive::Primitive;