diff --git a/Cargo.toml b/Cargo.toml
index d92a888..ccb7d10 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "bdflib"
-version = "0.3.4"
+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 f2aa775..bff9520 100644
--- a/src/io.rs
+++ b/src/io.rs
@@ -13,7 +13,7 @@ const ENTRIES_PER_CHUNK: u32 = 100_000;
 
 #[derive(Debug)]
 struct ThreadManager<T1, T2> {
-    pub sender_work: Option<Sender<T1>>,
+    pub sender_work: Sender<T1>,
     pub receiver_work: Receiver<T1>,
     pub sender_result: Sender<T2>,
     pub receiver_result: Receiver<T2>,
@@ -48,7 +48,7 @@ impl<T1, T2> ThreadManager<T1, T2> {
         let (s1, r1) = bounded(cap);
         let (s2, r2) = bounded(cap);
         Self {
-            sender_work: Some(s1),
+            sender_work: s1,
             receiver_work: r1,
             sender_result: s2,
             receiver_result: r2,
@@ -59,7 +59,10 @@ impl<T1, T2> ThreadManager<T1, T2> {
 
     /// Drops the sender for work.
     pub fn drop_sender(&mut self) {
-        self.sender_work = None;
+        let sender = self.sender_work.clone();
+        let (s1, _) = bounded(0);
+        self.sender_work = s1;
+        drop(sender);
     }
 
     /// Waits for the wait group
@@ -94,7 +97,7 @@ impl BDFWriter {
     }
 
     /// Starts threads for parallel chunk compression
-    pub fn start_threads(&self) {
+    fn start_threads(&self) {
         for _ in 0..num_cpus::get() {
             let compress = self.compressed;
             let compression_level = self.compression_level;
@@ -158,16 +161,9 @@ impl BDFWriter {
             self.start_threads();
             self.thread_manager.threads_started = true;
         }
-        let mut data_chunk =
+        let data_chunk =
             GenericChunk::from_data_entries(&self.data_entries, &self.lookup_table);
-        if let Some(sender) = &self.thread_manager.sender_work {
-            sender.send(data_chunk).expect("failed to send work to threads");
-        } else {
-            if self.compressed {
-                data_chunk.compress(self.compression_level)?;
-            }
-            self.thread_manager.sender_result.send(data_chunk.serialize()).expect("failed to send serialization result");
-        }
+        self.thread_manager.sender_work.send(data_chunk).expect("failed to send work to threads");
         self.write_serialized()?;
         self.data_entries = Vec::new();
 
diff --git a/src/lib.rs b/src/lib.rs
index 038a8b1..12eaf03 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -36,9 +36,9 @@ mod tests {
 
     #[test]
     fn it_writes_compressed() -> Result<(), Error> {
-        let mut writer = new_writer("tmp2.bdf", 3, true)?;
+        let mut writer = new_writer("tmp2.bdf", 4, true)?;
         writer.set_compression_level(3);
-        writer.set_entries_per_chunk(2)?;
+        writer.set_entries_per_chunk(3)?;
 
         writer.add_lookup_entry(HashEntry::new(FOO.to_string(), 4))?;
         writer.add_lookup_entry(HashEntry::new(BAR.to_string(), 5))?;
@@ -58,6 +58,11 @@ mod tests {
         entry_3.add_hash_value(FOO.to_string(), vec![5, 5, 2, 3]);
         writer.add_data_entry(entry_3)?;
 
+        let mut entry_4 = DataEntry::new("lool".to_string());
+        entry_4.add_hash_value(BAR.to_string(), vec![1, 3, 2, 1, 5]);
+        entry_4.add_hash_value(FOO.to_string(), vec![5, 5, 2, 3]);
+        writer.add_data_entry(entry_4)?;
+
         writer.finish()?;
 
         remove_file("tmp2.bdf")?;