diff --git a/src/elements/mod.rs b/src/elements/mod.rs
index fca2dae..37a8f9f 100644
--- a/src/elements/mod.rs
+++ b/src/elements/mod.rs
@@ -18,7 +18,7 @@ pub use self::export_entry::{ExportEntry, Internal};
 pub use self::global_entry::GlobalEntry;
 pub use self::primitives::{
     VarUint32, VarUint7, VarUint1, VarInt7, Uint32, 
-    Uint64, VarUint64, CountedList, CountedWriter,
+    Uint64, VarUint64, CountedList, CountedWriter, CountedListWriter,
 };
 pub use self::types::{ValueType, BlockType};
 pub use self::ops::{Opcode, Opcodes, InitExpr};
diff --git a/src/elements/primitives.rs b/src/elements/primitives.rs
index 18f1364..7a5fc11 100644
--- a/src/elements/primitives.rs
+++ b/src/elements/primitives.rs
@@ -221,7 +221,7 @@ impl<T: Deserialize> CountedList<T> {
     pub fn into_inner(self) -> Vec<T> { self.0 }
 }
 
-impl<T: Deserialize> Deserialize for CountedList<T> where T::Error : From<Error> {
+impl<T: Deserialize> Deserialize for CountedList<T> where T::Error: From<Error> {
     type Error = T::Error;
 
     fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
@@ -272,6 +272,22 @@ impl<'a, W: 'a + io::Write> io::Write for CountedWriter<'a, W> {
     }    
 }
 
+pub struct CountedListWriter<I: Serialize<Error=::elements::Error>, T: IntoIterator<Item=I>>(pub usize, pub T);
+
+impl<I: Serialize<Error=::elements::Error>, T: IntoIterator<Item=I>> Serialize for CountedListWriter<I, T> {
+    type Error = Error;
+    
+    fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
+        let len_us = self.0;
+        let data = self.1;
+        let len: VarUint32 = len_us.into();
+        len.serialize(writer)?;
+        for data_element in data { data_element.serialize(writer)? }
+
+        Ok(())
+    }
+}
+
 #[cfg(test)]
 mod tests {
 
diff --git a/src/elements/section.rs b/src/elements/section.rs
index 1699f2e..5c489ae 100644
--- a/src/elements/section.rs
+++ b/src/elements/section.rs
@@ -1,5 +1,4 @@
 use std::io;
-use std::io::Write;
 use super::{
     Serialize,
     Deserialize,
@@ -18,6 +17,7 @@ use super::{
     ElementSegment,
     DataSegment,
     CountedWriter,
+    CountedListWriter,
 };
 
 use super::types::Type;
@@ -296,10 +296,12 @@ impl Serialize for DataSection {
     type Error = Error;
     
     fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
-        let mut counted_writer = CountedWriter::new(writer);
-        let test = vec![0u8; 12];
-        counted_writer.write(&test[..])?;
-        counted_writer.done()?;
+        let data = self.0;
+        let counted_list = CountedListWriter::<DataSegment, _>(
+            data.len(),
+            data.into_iter().map(Into::into),
+        );
+        counted_list.serialize(writer)?;
         Ok(())
     }
 }
diff --git a/src/elements/segment.rs b/src/elements/segment.rs
index 7756127..3cd3b79 100644
--- a/src/elements/segment.rs
+++ b/src/elements/segment.rs
@@ -1,5 +1,5 @@
 use std::io;
-use super::{Deserialize, Error, VarUint32, CountedList, InitExpr};
+use super::{Deserialize, Serialize, Error, VarUint32, CountedList, InitExpr};
 
 pub struct ElementSegment {
     index: u32,
@@ -62,4 +62,12 @@ impl Deserialize for DataSegment {
             value: value_buf,
         })
     }   
+}
+
+impl Serialize for DataSegment {
+    type Error = Error;
+    
+    fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
+        Ok(())
+    }
 }
\ No newline at end of file