diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4f97c14..1d93ae9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,7 @@
 - `Innmind\Http\Header\SetCookie\Expires`
 - `Innmind\Http\Header\SetCookie\MaxAge`
 - `Innmind\Http\Header\SetCookie\Path`
+- `Innmind\Http\Header\ContentType\Boundary::toHeader()`
 
 ### Changed
 
diff --git a/README.md b/README.md
index 1da8d2b..f04df1d 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,6 @@ use Innmind\Http\{
     Request,
     Method,
     Content\Multipart,
-    Header\ContentType,
     Header\ContentType\Boundary,
     Headers,
     ProtocolVersion,
@@ -77,7 +76,7 @@ $request = Request::of(
     Url::of('http://some-server.com/')
     Method::post,
     ProtocolVersion::v11,
-    Headers::of(ContentType::of('multipart', 'form-data', $boundary)),
+    Headers::of($boundary->toHeader()),
     Multipart::boundary($boundary)
         ->with('some[key]', 'some value')
         ->withFile('some[file]', File::named(
diff --git a/src/Header/ContentType/Boundary.php b/src/Header/ContentType/Boundary.php
index d12f581..66004c4 100644
--- a/src/Header/ContentType/Boundary.php
+++ b/src/Header/ContentType/Boundary.php
@@ -4,9 +4,11 @@
 namespace Innmind\Http\Header\ContentType;
 
 use Innmind\Http\{
+    Header\ContentType,
     Header\Parameter,
     Exception\DomainException,
 };
+use Innmind\MediaType;
 use Innmind\Immutable\{
     Str,
     Maybe,
@@ -63,6 +65,19 @@ public function value(): string
         return $this->value;
     }
 
+    public function toHeader(): ContentType
+    {
+        return ContentType::of(new MediaType\MediaType(
+            'multipart',
+            'form-data',
+            '',
+            new MediaType\Parameter(
+                'boundary',
+                $this->value,
+            ),
+        ));
+    }
+
     public function toParameter(): Parameter
     {
         return Parameter::of('boundary', $this->value);
diff --git a/tests/Content/MultipartTest.php b/tests/Content/MultipartTest.php
index 8a1f3cf..56ba74b 100644
--- a/tests/Content/MultipartTest.php
+++ b/tests/Content/MultipartTest.php
@@ -135,7 +135,7 @@ public function testFunctional()
                 \curl_setopt($handle, \CURLOPT_HEADER, false);
                 \curl_setopt($handle, \CURLOPT_RETURNTRANSFER, true);
                 \curl_setopt($handle, \CURLOPT_HTTPHEADER, [
-                    'Content-Type: multipart/form-data; '.$boundary->toParameter()->toString(),
+                    $boundary->toHeader()->normalize()->toString(),
                 ]);
                 \curl_setopt($handle, \CURLOPT_CUSTOMREQUEST, 'POST');
                 \curl_setopt($handle, \CURLOPT_UPLOAD, true);