diff --git a/lib/pow_assent/http_adapter/httpc.ex b/lib/pow_assent/http_adapter/httpc.ex
index fd5054b..fb4c400 100644
--- a/lib/pow_assent/http_adapter/httpc.ex
+++ b/lib/pow_assent/http_adapter/httpc.ex
@@ -80,16 +80,11 @@ defmodule PowAssent.HTTPAdapter.Httpc do
   defp ssl_opts(url) do
     %{host: host} = URI.parse(url)
 
-    # This will prevent warnings from showing up if :certifi or
-    # :ssl_verify_hostname isn't available
-    certifi_mod = :certifi
-    ssl_verify_hostname_mod = :ssl_verify_hostname
-
     [
       verify: :verify_peer,
       depth: 99,
-      cacerts: certifi_mod.cacerts(),
-      verify_fun: {&ssl_verify_hostname_mod.verify_fun/3, check_hostname: to_charlist(host)}
+      cacerts: :certifi.cacerts(),
+      verify_fun: {&:ssl_verify_hostname.verify_fun/3, check_hostname: to_charlist(host)}
     ]
   end
 end
diff --git a/mix.exs b/mix.exs
index 812cb1b..bbc8521 100644
--- a/mix.exs
+++ b/mix.exs
@@ -19,7 +19,9 @@ defmodule PowAssent.MixProject do
 
       # Docs
       name: "PowAssent",
-      docs: docs()
+      docs: docs(),
+
+      xref: [exclude: [Mint.HTTP, :certifi, :ssl_verify_hostname]]
     ]
   end