diff --git a/CHANGELOG.md b/CHANGELOG.md
index ef6f2b6..e8b8ee4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,17 @@ This project adheres to [Semantic Versioning](http://semver.org/) and
 [Keep a CHANGELOG](http://keepachangelog.com).
 
 
+## Unreleased
+
+### Fixed
+
+- `RDF.write_file` and `RDF.write_file!` delegators had wrong signatures
+
+
+[Compare v0.5.3...HEAD](https://github.com/marcelotto/rdf-ex/compare/v0.5.3...HEAD)
+
+
+
 ## 0.5.3 - 2018-11-11
 
 ### Added
diff --git a/lib/rdf.ex b/lib/rdf.ex
index 24cf21e..6600a67 100644
--- a/lib/rdf.ex
+++ b/lib/rdf.ex
@@ -40,14 +40,14 @@ defmodule RDF do
   alias RDF.{IRI, Namespace, Literal, BlankNode, Triple, Quad,
              Description, Graph, Dataset}
 
-  defdelegate read_string(content, opts),        to: RDF.Serialization
-  defdelegate read_string!(content, opts),       to: RDF.Serialization
-  defdelegate read_file(filename, opts \\ []),   to: RDF.Serialization
-  defdelegate read_file!(filename, opts \\ []),  to: RDF.Serialization
-  defdelegate write_string(content, opts),       to: RDF.Serialization
-  defdelegate write_string!(content, opts),      to: RDF.Serialization
-  defdelegate write_file(filename, opts \\ []),  to: RDF.Serialization
-  defdelegate write_file!(filename, opts \\ []), to: RDF.Serialization
+  defdelegate read_string(content, opts),                 to: RDF.Serialization
+  defdelegate read_string!(content, opts),                to: RDF.Serialization
+  defdelegate read_file(filename, opts \\ []),            to: RDF.Serialization
+  defdelegate read_file!(filename, opts \\ []),           to: RDF.Serialization
+  defdelegate write_string(content, opts),                to: RDF.Serialization
+  defdelegate write_string!(content, opts),               to: RDF.Serialization
+  defdelegate write_file(content, filename, opts \\ []),  to: RDF.Serialization
+  defdelegate write_file!(content, filename, opts \\ []), to: RDF.Serialization
 
 
   @doc """