diff --git a/src/cowboy_clock.erl b/src/cowboy_clock.erl
index e29b640f..747bffee 100644
--- a/src/cowboy_clock.erl
+++ b/src/cowboy_clock.erl
@@ -44,7 +44,9 @@
 -define(SERVER, ?MODULE).
 -define(TABLE, ?MODULE).
 
+-ifdef(TEST).
 -include_lib("eunit/include/eunit.hrl").
+-endif.
 
 %% API.
 
diff --git a/src/cowboy_cookies.erl b/src/cowboy_cookies.erl
index 4accf148..d10c8489 100644
--- a/src/cowboy_cookies.erl
+++ b/src/cowboy_cookies.erl
@@ -36,7 +36,9 @@
 
 -define(QUOTE, $\").
 
+-ifdef(TEST).
 -include_lib("eunit/include/eunit.hrl").
+-endif.
 
 %% API.
 
diff --git a/src/cowboy_dispatcher.erl b/src/cowboy_dispatcher.erl
index e0f121ea..445e8fad 100644
--- a/src/cowboy_dispatcher.erl
+++ b/src/cowboy_dispatcher.erl
@@ -32,7 +32,9 @@
 -export_type([tokens/0]).
 -export_type([dispatch_rules/0]).
 
+-ifdef(TEST).
 -include_lib("eunit/include/eunit.hrl").
+-endif.
 
 %% API.
 
diff --git a/src/cowboy_http.erl b/src/cowboy_http.erl
index 7ad3d2f6..aea71c16 100644
--- a/src/cowboy_http.erl
+++ b/src/cowboy_http.erl
@@ -80,7 +80,9 @@
 -export_type([headers/0]).
 -export_type([status/0]).
 
+-ifdef(TEST).
 -include_lib("eunit/include/eunit.hrl").
+-endif.
 
 %% Parsing.
 
diff --git a/src/cowboy_multipart.erl b/src/cowboy_multipart.erl
index 26ea84f9..40400736 100644
--- a/src/cowboy_multipart.erl
+++ b/src/cowboy_multipart.erl
@@ -30,7 +30,9 @@
 -type end_of_part() :: {end_of_part, cont(more(part_result()))}.
 -type disposition() :: {binary(), [{binary(), binary()}]}.
 
+-ifdef(TEST).
 -include_lib("eunit/include/eunit.hrl").
+-endif.
 
 %% API.
 
diff --git a/src/cowboy_protocol.erl b/src/cowboy_protocol.erl
index d2f97a70..8020b312 100644
--- a/src/cowboy_protocol.erl
+++ b/src/cowboy_protocol.erl
@@ -42,7 +42,9 @@
 -export([parse_request/1]).
 -export([handler_loop/3]).
 
+-ifdef(TEST).
 -include_lib("eunit/include/eunit.hrl").
+-endif.
 
 -record(state, {
 	listener :: pid(),
diff --git a/src/cowboy_req.erl b/src/cowboy_req.erl
index 3c812544..e9cb6b56 100644
--- a/src/cowboy_req.erl
+++ b/src/cowboy_req.erl
@@ -118,7 +118,9 @@
 -export([to_list/1]).
 -export([transport/1]).
 
+-ifdef(TEST).
 -include_lib("eunit/include/eunit.hrl").
+-endif.
 
 -record(http_req, {
 	%% Transport.