diff --git a/Cargo.toml b/Cargo.toml
index b9be29d..ccb7d10 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "bdflib"
-version = "0.3.6"
+version = "0.3.5"
 authors = ["trivernis <trivernis@gmail.com>"]
 edition = "2018"
 license-file = "LICENSE"
diff --git a/src/io.rs b/src/io.rs
index bbf80ff..bff9520 100644
--- a/src/io.rs
+++ b/src/io.rs
@@ -12,7 +12,7 @@ use crossbeam_utils::sync::WaitGroup;
 const ENTRIES_PER_CHUNK: u32 = 100_000;
 
 #[derive(Debug)]
-pub struct ThreadManager<T1, T2> {
+struct ThreadManager<T1, T2> {
     pub sender_work: Sender<T1>,
     pub receiver_work: Receiver<T1>,
     pub sender_result: Sender<T2>,
@@ -38,7 +38,7 @@ pub struct BDFWriter {
     head_written: bool,
     compressed: bool,
     compression_level: u32,
-    pub thread_manager: ThreadManager<GenericChunk, Vec<u8>>,
+    thread_manager: ThreadManager<GenericChunk, Vec<u8>>,
 }
 
 impl<T1, T2> ThreadManager<T1, T2> {