diff --git a/lib/igniter/libs/phoenix.ex b/lib/igniter/libs/phoenix.ex
index c784679..852d610 100644
--- a/lib/igniter/libs/phoenix.ex
+++ b/lib/igniter/libs/phoenix.ex
@@ -7,7 +7,7 @@ defmodule Igniter.Libs.Phoenix do
   @spec web_module_name() :: module()
   @deprecated "Use `web_module/0` instead."
   def web_module_name do
-    Module.concat([inspect(Igniter.Project.Module.module_name_prefix(Igniter.new())) <> "Web"])
+    web_module(Igniter.new())
   end
 
   @doc """
@@ -15,7 +15,16 @@ defmodule Igniter.Libs.Phoenix do
   """
   @spec web_module(Igniter.t()) :: module()
   def web_module(igniter) do
-    Module.concat([inspect(Igniter.Project.Module.module_name_prefix(igniter)) <> "Web"])
+    prefix =
+      igniter
+      |> Igniter.Project.Module.module_name_prefix()
+      |> inspect()
+
+    if String.ends_with?(prefix, "Web") do
+      Module.concat([prefix])
+    else
+      Module.concat([prefix <> "Web"])
+    end
   end
 
   @doc "Returns `true` if the module is a Phoenix HTML module"
@@ -66,10 +75,7 @@ defmodule Igniter.Libs.Phoenix do
   @spec web_module_name(String.t()) :: module()
   @deprecated "Use `web_module_name/2` instead."
   def web_module_name(suffix) do
-    Module.concat(
-      inspect(Igniter.Project.Module.module_name_prefix(Igniter.new())) <> "Web",
-      suffix
-    )
+    Module.concat(web_module(Igniter.new()), suffix)
   end
 
   @doc """
@@ -77,7 +83,7 @@ defmodule Igniter.Libs.Phoenix do
   """
   @spec web_module_name(Igniter.t(), String.t()) :: module()
   def web_module_name(igniter, suffix) do
-    Module.concat(inspect(Igniter.Project.Module.module_name_prefix(igniter)) <> "Web", suffix)
+    Module.concat(web_module(igniter), suffix)
   end
 
   @doc "Gets the list of endpoints that use a given router"
@@ -555,7 +561,7 @@ defmodule Igniter.Libs.Phoenix do
     end)
   end
 
-  @doc "Moves to the use statement in a module that matches `use TheirWebModule, :router`"
+  @doc "Moves to the use statement in a module that matches `use TheirAppWeb, :router`"
   @spec move_to_router_use(Igniter.t(), Sourceror.Zipper.t()) ::
           :error | {:ok, Sourceror.Zipper.t()}
   def move_to_router_use(igniter, zipper) do
@@ -564,7 +570,7 @@ defmodule Igniter.Libs.Phoenix do
              Igniter.Code.Function.argument_equals?(
                zipper,
                0,
-               router_using(igniter)
+               web_module(igniter)
              ) &&
                Igniter.Code.Function.argument_equals?(
                  zipper,
@@ -628,10 +634,6 @@ defmodule Igniter.Libs.Phoenix do
     end
   end
 
-  defp router_using(igniter) do
-    Module.concat([to_string(Igniter.Project.Module.module_name_prefix(igniter)) <> "Web"])
-  end
-
   defp using_a_webbish_module?(zipper) do
     case Igniter.Code.Function.move_to_nth_argument(zipper, 0) do
       {:ok, zipper} ->
diff --git a/test/igniter/libs/phoenix_test.exs b/test/igniter/libs/phoenix_test.exs
index 3b5bebc..a1c2e58 100644
--- a/test/igniter/libs/phoenix_test.exs
+++ b/test/igniter/libs/phoenix_test.exs
@@ -24,4 +24,46 @@ defmodule Igniter.Libs.PhoenixTest do
       refute Igniter.Libs.Phoenix.controller?(igniter, TestWeb.ThingView)
     end
   end
+
+  describe "web_module/1" do
+    test "append Web" do
+      mix_exs = """
+      defmodule Test.MixProject do
+      end
+      """
+
+      igniter =
+        assert test_project()
+               |> Igniter.create_or_update_elixir_file(
+                 "mix.exs",
+                 mix_exs,
+                 &{:ok, Igniter.Code.Common.replace_code(&1, mix_exs)}
+               )
+               |> apply_igniter!()
+
+      assert Igniter.Libs.Phoenix.web_module(igniter) == TestWeb
+    end
+
+    test "do not append Web suffix if name already ends with Web" do
+      mix_exs = """
+      defmodule TestWeb.MixProject do
+      end
+      """
+
+      igniter =
+        assert test_project()
+               |> Igniter.create_or_update_elixir_file(
+                 "mix.exs",
+                 mix_exs,
+                 &{:ok, Igniter.Code.Common.replace_code(&1, mix_exs)}
+               )
+               |> apply_igniter!()
+
+      assert Igniter.Libs.Phoenix.web_module(igniter) == TestWeb
+    end
+  end
+
+  test "web_module_name/1" do
+    assert Igniter.Libs.Phoenix.web_module_name(test_project(), "Suffix") == TestWeb.Suffix
+  end
 end
diff --git a/test/igniter/project/module_test.exs b/test/igniter/project/module_test.exs
new file mode 100644
index 0000000..83e3246
--- /dev/null
+++ b/test/igniter/project/module_test.exs
@@ -0,0 +1,8 @@
+defmodule Igniter.Project.ModuleTest do
+  use ExUnit.Case
+  import Igniter.Test
+
+  test "module_name_prefix/1" do
+    assert Igniter.Project.Module.module_name_prefix(test_project()) == Test
+  end
+end