diff --git a/lib/response.ml b/lib/response.ml
index c1f7366c..c2782400 100644
--- a/lib/response.ml
+++ b/lib/response.ml
@@ -31,7 +31,7 @@
     POSSIBILITY OF SUCH DAMAGE.
   ----------------------------------------------------------------------------*)
 
-type t = Response0.t =
+type t =
   { version : Version.t
   ; status  : Status.t
   ; reason  : string
diff --git a/lib/response0.ml b/lib/response0.ml
deleted file mode 100644
index 4e5f1aaf..00000000
--- a/lib/response0.ml
+++ /dev/null
@@ -1,38 +0,0 @@
-(*----------------------------------------------------------------------------
-    Copyright (c) 2017 Inhabited Type LLC.
-
-    All rights reserved.
-
-    Redistribution and use in source and binary forms, with or without
-    modification, are permitted provided that the following conditions
-    are met:
-
-    1. Redistributions of source code must retain the above copyright
-       notice, this list of conditions and the following disclaimer.
-
-    2. Redistributions in binary form must reproduce the above copyright
-       notice, this list of conditions and the following disclaimer in the
-       documentation and/or other materials provided with the distribution.
-
-    3. Neither the name of the author nor the names of his contributors
-       may be used to endorse or promote products derived from this software
-       without specific prior written permission.
-
-    THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND ANY EXPRESS
-    OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-    DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
-    ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-    OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-    STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-    POSSIBILITY OF SUCH DAMAGE.
-  ----------------------------------------------------------------------------*)
-
-type t =
-  { version : Version.t
-  ; status  : Status.t
-  ; reason  : string
-  ; headers : Headers.t }
diff --git a/lib/serialize.ml b/lib/serialize.ml
index 800ca1a8..56f1b1f4 100644
--- a/lib/serialize.ml
+++ b/lib/serialize.ml
@@ -61,7 +61,7 @@ let write_request t { Request.meth; target; version; headers } =
   write_version t version; write_crlf  t;
   write_headers t headers
 
-let write_response t { Response0.version; status; reason; headers } =
+let write_response t { Response.version; status; reason; headers } =
   write_version t version; write_space t;
   write_status  t status ; write_space t;
   write_string  t reason ; write_crlf  t;